false positive on content_browsertests

_From [zhao...@chromium.org](https://code.google.com/u/111879852748806430180/) on May 14, 2014 16:32:23_

https://code.google.com/p/chromium/issues/detail?id=373393 Can be reproduced locally:

~/Workspace/DrMemory/builds/build_x86_drm_rel.git/bin/drmemory.exe -pause_at_error -suppress ./tools/valgrind/drmemory/suppressions.txt -suppress ./tools/valgrind/drmemory/suppressions_full.txt -callstack_max_frames 40 -- ./out/Release/content_browsertests.exe --no-sandbox --gtest_filter=BrowserPluginTest.ResizeFlowControl --ui-test-action-max-timeout=80000000 --ui-test-action-timeout=40000000

[ RUN ] BrowserPluginTest.ResizeFlowControl
[18468:14220:0514/205641:12289072:WARNING:resource_bundle.cc(276)] locale_file_path.empty()
Still waiting for the following processes to finish:
./out/Release/content_browsertests.exe --data-path="C:\src\tmp\usr\scoped_dir12968_31853\d12968_26470" --gtest_also_run_disabled_tests --gtest_filter=BrowserPluginTest.ResizeFlowControl --no-sandbox --single_process --ui-test-action-max-timeout=80000000 --ui-test-action-timeout=40000000 --use-fake-device-for-media-stream --use-fake-ui-for-media-stream
Still waiting for the following processes to finish:
./out/Release/content_browsertests.exe --data-path="C:\src\tmp\usr\scoped_dir12968_31853\d12968_26470" --gtest_also_run_disabled_tests --gtest_filter=BrowserPluginTest.ResizeFlowControl --no-sandbox --single_process --ui-test-action-max-timeout=80000000 --ui-test-action-timeout=40000000 --use-fake-device-for-media-stream --use-fake-ui-for-media-stream
~~Dr.M~~
~~Dr.M~~ Error `#1`: UNINITIALIZED READ: reading 0x0030f631-0x0030f634 3 byte(s) within 0x0030f630-0x0030f634
~~Dr.M~~ # 0 testing::internal::CmpHelperEQ<> [d:\src\chrome-int\src\testing\gtest\include\gtest\gtest.h:1396]
~~Dr.M~~ # 1 testing::internal::EqHelper<>::Compare<> [d:\src\chrome-int\src\testing\gtest\include\gtest\gtest.h:1433]
~~Dr.M~~ # 2 content::BrowserPluginTest_ResizeFlowControl_Test::TestBody [d:\src\chrome-int\src\content\renderer\browser_plugin\browser_plugin_browsertest.cc:335]
~~Dr.M~~ # 3 testing::internal::HandleExceptionsInMethodIfSupported<> [d:\src\chrome-int\src\testing\gtest\src\gtest.cc:2045]

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=1546_