invalid heap arg errors in msvcp100d.dll suddenly raised on chromium tests

_From [bruen...@google.com](https://code.google.com/u/109494838902877177630/) on January 29, 2014 12:00:22_

After getting our win7-cr bot green, it went back red with a bunch of
invalid heap arg errors in msvcp100d.dll: http://build.chromium.org/p/client.drmemory/builders/win7-cr/builds/4910/steps/Chromium%20%27url%27%20tests/logs/stdio The errors are like this and happen on just about every test:

~~Dr.M~~ Error `#1`: INVALID HEAP ARGUMENT to free 0x03471a60
~~Dr.M~~ # 0 replace_free [e:\b\build\slave\win-builder\drmemory\common\alloc_replace.c:2352]
~~Dr.M~~ # 1 MSVCP100D.dll!std::_Yarn<>::_Tidy +0x1e (0x6cca247f )
~~Dr.M~~ # 2 MSVCP100D.dll!std::_Yarn<>::~_Yarn<> +0x10 (0x6cca1731 )
~~Dr.M~~ # 3 MSVCP100D.dll!std::_Locinfo::~_Locinfo +0x49 (0x6cc9bb7a )
~~Dr.M~~ # 4 MSVCP100D.dll!std::num_put<>::_Getcat +0xe4 (0x6ccafa05 )
~~Dr.M~~ # 5 MSVCP100D.dll!std::time_put<>::do_put +0x41ee (0x6ccd649f )
~~Dr.M~~ # 6 MSVCP100D.dll!std::basic_ostream<>::operator<< +0x85 (0x6ccbc2a6 )
~~Dr.M~~ # 7 testing::Message::operator<<<> [testing\gtest\include\gtest\gtest-message.h:131]
~~Dr.M~~ # 8 testing::internal::StreamableToString<> [testing\gtest\include\gtest\gtest-message.h:244]
~~Dr.M~~ # 9 testing::FormatCountableNoun [testing\gtest\src\gtest.cc:2382]
~~Dr.M~~ `#10` testing::FormatTestCaseCount [testing\gtest\src\gtest.cc:2392]
~~Dr.M~~ `#11` testing::internal::PrettyUnitTestResultPrinter::OnTestIterationStart [testing\gtest\src\gtest.cc:2643]
~~Dr.M~~ `#12` testing::internal::TestEventRepeater::OnTestIterationStart [testing\gtest\src\gtest.cc:2888]
~~Dr.M~~ `#13` testing::internal::UnitTestImpl::RunAllTests [testing\gtest\src\gtest.cc:4051]
~~Dr.M~~ `#14` testing::internal::HandleExceptionsInMethodIfSupported<> [testing\gtest\src\gtest.cc:2045]
~~Dr.M~~ Note: @0:00:00.889 in thread 196

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=1428_