Bug 15762 happens on Linux, too, so move suppression to generic file....

tools/valgrind/suppressions_mac.txt

 # There are three kinds of suppressions in this file:
 # 1. Third party stuff we have no control over.
 #
 # 2. Intentional unit test errors, stuff that is somehow a false positive
 # in our own code, or stuff that is so trivial it's not worth fixing.
 #
 # 3. Suppressions for real chromium bugs that are not yet fixed.
 # These should all be in chromium's bug tracking system.
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 270 matching lines @@
    fun:_ZN24ExtensionsServiceBackend19OnExtensionUnpackedERK8FilePathS2_SsbRK15DictionaryValueRKSt6vectorI6Tuple2I8SkBitmapS0_ESaIS9_EE
 }
 {
    bug_12640d
    Memcheck:Cond
    fun:_ZN10PNGEncoder18EncodeBGRASkBitmapERK8SkBitmapbPSt6vectorIhSaIhEE
    fun:_ZN24ExtensionsServiceBackend19OnExtensionUnpackedERK8FilePathS2_SsbRK15DictionaryValueRKSt6vectorI6Tuple2I8SkBitmapS0_ESaIS9_EE
    fun:_ZN24ExtensionsServiceBackend14UnpackerClient30OnUnpackExtensionSucceededImplERK15DictionaryValueRKSt6vectorI6Tuple2I8SkBitmap8FilePathESaIS8_EE
 }
 {
-   bug_15762
-   Memcheck:Cond
-   fun:_ZN7testing8internal11CmpHelperEQIjjEENS_15AssertionResultEPKcS4_RKT_RKT0_
-   fun:_ZN7testing8internal8EqHelperILb0EE7CompareIjjEENS_15AssertionResultEPKcS6_RKT_RKT0_
-   fun:_ZN39ImageOperations_CreateMaskedBitmap_Test8TestBodyEv
-   fun:_ZN7testing4Test3RunEv
-   fun:_ZN7testing8internal12TestInfoImpl3RunEv
-   fun:_ZN7testing8internal12TestInfoImpl7RunTestEPNS_8TestInfoE
-   fun:_ZNK7testing8internal4ListIPNS_8TestInfoEE7ForEachIPFvS3_EEEvT_
-   fun:_ZN7testing8TestCase3RunEv
-   fun:_ZN7testing8TestCase11RunTestCaseEPS0_
-   fun:_ZNK7testing8internal4ListIPNS_8TestCaseEE7ForEachIPFvS3_EEEvT_
-   fun:_ZN7testing8internal12UnitTestImpl11RunAllTestsEv
-   fun:_ZN7testing8UnitTest3RunEv
-   fun:main
-}
-{
    bug_15819a
    Memcheck:Cond
    fun:_ZNK10CMMMtxOnly10ConvertMinE10CMM3x3Type10CMM3x1TypeR12CMMMinBuffermm
    ...
    fun:CGContextDrawImage
    fun:_ZN3gfx17CGImageToSkBitmapEP7CGImage
 }
 {
    bug_15819b
    Memcheck:Value4
@@ skipping 20 matching lines @@
    fun:_Znwm
    fun:_ZN3IPC11SyncChannelC1ERKSsNS_7Channel4ModeEPNS3_8ListenerEPNS_12ChannelProxy13MessageFilterEP11MessageLoopbPN4base13WaitableEventE
    fun:_ZN11ChildThread4InitEv
    fun:_ZN12RenderThread4InitEv
    fun:_ZN4base6Thread10ThreadMainEv
    fun:_ZL10ThreadFuncPv
    fun:_pthread_start
    fun:thread_start
 }