DrMemory change content_unittests behavior

_From [zhao...@google.com](https://code.google.com/u/106321947286816917100/) on March 07, 2014 10:48:28_

$ ./out/Debug/content_unittests.exe --gtest_filter=NavigationControllerTest.PurgeScreenshot
Valgrind detected, switching to single process mode.
Pass --test-launcher-debug-launcher to valgrind the launcher itself.
Note: Google Test filter = NavigationControllerTest.PurgeScreenshot
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from NavigationControllerTest
[ RUN ] NavigationControllerTest.PurgeScreenshot
[ OK ] NavigationControllerTest.PurgeScreenshot (141 ms)
[----------] 1 test from NavigationControllerTest (143 ms total)

[----------] Global test environment tear-down
[==========] 1 test from 1 test case ran. (143 ms total)
[ PASSED ] 1 test.

YOU HAVE 26 DISABLED TESTS

zhaoqin@ZHAOQIN4-W /cygdrive/d/src/chrome-int/src
$ ~/Workspace/DrMemory/builds/build_x86_drm_rel.git/bin/drmemory.exe -logdir 'C:\Users\zhaoqin\AppData\LocalLow\drmemory.logs' -suppress ../suppressions.txt -suppress ../suppressions_full.txt -no_count_leaks -callstack_max_frames 40 -- ./out/Debug/content_unittests.exe --gtest_filter=NavigationControllerTest.PurgeScreenshot --ui-test-action-timeout=40000000 --ui-test-action-max-timeout=80000000
~~Dr.M~~ Dr. Memory version 1.6.1758
~~Dr.M~~ Running "./out/Debug/content_unittests.exe --gtest_filter=NavigationControllerTest.PurgeScreenshot --ui-test-action-timeout=40000000 --ui-test-action-max-timeout=80000000"
~~Dr.M~~ Recorded 68 suppression(s) from user D:\src\chrome-int\suppressions.txt
~~Dr.M~~ Recorded 269 suppression(s) from user D:\src\chrome-int\suppressions_full.txt
Valgrind detected, switching to single process mode.
Pass --test-launcher-debug-launcher to valgrind the launcher itself.
Note: Google Test filter = NavigationControllerTest.PurgeScreenshot
[==========] Running 1 test from 1 test case.
[----------] Global test environment set-up.
[----------] 1 test from NavigationControllerTest
[ RUN ] NavigationControllerTest.PurgeScreenshot
Backtrace:
check_size [0x176578EE+14](d:srcchrome-intsrcthird_partymesasrcsrcmesavbovbo_context.c:40)
init_legacy_currval [0x17657AC2+114](d:srcchrome-intsrcthird_partymesasrcsrcmesavbovbo_context.c:63)
_vbo_CreateContext [0x17657734+84](d:srcchrome-intsrcthird_partymesasrcsrcmesavbovbo_context.c:164)
OSMesaCreateContextExt [0x175ADAFA+1098](d:srcchrome-intsrcthird_partymesasrcsrcmesadriversosmesaosmesa.c:768)
gfx::OSMESAApiBase::OSMesaCreateContextExtFn [0x05225B46+38](d:srcchrome-intsrcoutdebuggenuiglgl_bindings_autogen_osmesa.cc:180)
gfx::GLContextOSMesa::Initialize [0x051E37F9+393](d:srcchrome-intsrcuiglgl_context_osmesa.cc:34)
gfx::GLContext::CreateGLContext [0x051E566A+346](d:srcchrome-intsrcuiglgl_context_win.cc:31)
gpu::InProcessCommandBuffer::InitializeOnGpuThread [0x04DDC114+2724](d:srcchrome-intsrcgpucommand_bufferservicein_process_command_buffer.cc:376)
base::internal::RunnableAdapter::Run [0x04DDF276+38](d:srcchrome-intsrcbasebind_internal.h:191)
base::internal::InvokeHelper<0,bool,base::internal::RunnableAdapter,void __cdecl(gpu::InProcessCommandBuffer _,gpu::InProcessCommandBuffer: [0x04DDD3C7+39](d:srcchrome-intsrcbasebind_internal.h:891)
base::internal::Invoker<2,base::internal::BindState,bool __cdecl(gpu::InProcessCommandBuffer _,gpu::InProce [0x04DDEA2C+92](d:srcchrome-intsrcbasebind_internal.h:1253)
base::Callback::Run [0x04DDE41E+30](d:srcchrome-intsrcbasecallback.h:401)
gpu::`anonymous namespace'::RunTaskWithResult [0x04DD4441+49](d:srcchrome-intsrcgpucommand_bufferservicein_process_command_buffer.cc:54)
base::internal::RunnableAdapter,bool _,base::WaitableEvent *)>::Run [0x04DDEEE8+72](d:srcchrome-intsrcbasebind_internal.h:289)
base::internal::InvokeHelper<0,void,base::internal::RunnableAdapter,bool _,base::WaitableEvent *)>,void __cdecl(base::Callback const &,bool \* const &,base::WaitableEvent \* const &)>::M [0x04DDD142+50](d:srcchrome-intsrcbasebind_internal.h:928)
base::internal::Invoker<3,base::internal::BindState,bool *,base::WaitableEvent *)>,void __cdecl(base::Callback,bool *,base::WaitableEvent *),void __cdec [0x04DDEB65+117](d:srcchrome-intsrcbasebind_internal.h:1383)
base::Callback::Run [0x02627F3E+30](d:srcchrome-intsrcbasecallback.h:401)
base::MessageLoop::RunTask [0x026CDF70+768](d:srcchrome-intsrcbasemessage_loopmessage_loop.cc:451)
base::MessageLoop::DeferOrRunPendingTask [0x026CB75D+45](d:srcchrome-intsrcbasemessage_loopmessage_loop.cc:464)
base::MessageLoop::DoWork [0x026CBD37+231](d:srcchrome-intsrcbasemessage_loopmessage_loop.cc:575)
base::MessagePumpDefault::Run [0x026D0FC3+211](d:srcchrome-intsrcbasemessage_loopmessage_pump_default.cc:32)
base::MessageLoop::RunHandler [0x026CDC0D+269](d:srcchrome-intsrcbasemessage_loopmessage_loop.cc:400)
base::RunLoop::Run [0x027228B2+34](d:srcchrome-intsrcbaserun_loop.cc:50)
base::MessageLoop::Run [0x026CDABF+63](d:srcchrome-intsrcbasemessage_loopmessage_loop.cc:293)
base::Thread::Run [0x0276DDBF+15](d:srcchrome-intsrcbasethreadingthread.cc:173)
base::Thread::ThreadMain [0x0276E8DB+667](d:srcchrome-intsrcbasethreadingthread.cc:226)
base::`anonymous namespace'::ThreadFunc [0x0275875A+202](d:srcchrome-intsrcbasethreadingplatform_thread_win.cc:80)
BaseThreadInitThunk [0x74D3336A+14]
__RtlUserThreadStart [0x775E9F72+112]
_RtlUserThreadStart [0x775E9F45+27]
~~14928~~
~~14928~~ NO ERRORS FOUND:
~~14928~~ 0 unique, 0 total unaddressable access(es)
~~14928~~ 0 unique, 0 total uninitialized access(es)
~~14928~~ 0 unique, 0 total invalid heap argument(s)
~~14928~~ 0 unique, 0 total GDI usage error(s)
~~14928~~ 0 unique, 0 total handle leak(s)
~~14928~~ 0 unique, 0 total warning(s)
~~14928~~ ERRORS IGNORED:
~~14928~~ 66 potential error(s) (suspected false positives)
~~14928~~ (details: C:\Users\zhaoqin\AppData\LocalLow\drmemory.logs\DrMemory-content_unittests.exe.16964.000\potential_errors.txt)
~~14928~~ 10 user-suppressed, 3 default-suppressed error(s)
~~14928~~ Details: C:\Users\zhaoqin\AppData\LocalLow\drmemory.logs\DrMemory-content_unittests.exe.16964.000\results.txt
~~Dr.M~~ WARNING: application exited with abnormal code 0xc0000005
Segmentation fault

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=1472_