Exclude failing content_browsertests test under Dr. Memory

TBR=zhaoqin@chromium.org
BUG=http://code.google.com/p/drmemory/issues/detail?id=1528
NOTRY=true

Review URL: https://codereview.chromium.org/401313004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284564 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/gtest_exclude/content_browsertests.gtest-drmemory_win32.txt

 # crbug.com/389132
 WebRtcBrowserTest.TwoCallsWithAecDump
-# failed test
+
+# http://code.google.com/p/drmemory/issues/detail?id=1528
+# Un-analyzed test failures:
 DeviceInertialSensorBrowserTest.MotionNullTestWithAlert
 DeviceInertialSensorBrowserTest.OrientationNullTestWithAlert
 File/MediaTest.VideoTulipWebm/0
 Http/MediaTest.VideoBearTheora/0
 Http/MediaTest.VideoTulipWebm/0
+IndexedDBBrowserTest.DeleteCompactsBackingStore
 MSE_ClearKey/EncryptedMediaTest.FrameSizeChangeVideo/0
 OutOfProcessPPAPITest.MediaStreamAudioTrack
 OutOfProcessPPAPITest.NetworkProxy