Removing WebRTCAudioDeviceTest test suite

tools/valgrind/memcheck/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 # running overnight and removing outdated bugs/suppressions.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 1992 matching lines @@
    fun:_ZN3gfx46VideoDecodeAccelerationSupportTest_Create_Test8TestBodyEv
 }
 {
    bug_131361
    Memcheck:Overlap
    fun:memcpy
    ...
    fun:_ZN2v88internal18GvnBasicBlockState32*
 }
 {
-   bug_148865
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN7content16RenderThreadImpl4InitEv
-   fun:_ZN7content16RenderThreadImplC2ERKSs
-   fun:_ZN7content16RenderThreadImplC1ERKSs
-   fun:_ZN7content21WebRTCAudioDeviceTest5SetUpEv
-}
-{
    bug_159190
    Memcheck:Uninitialized
    ...
    fun:_ZNK19TConcreteFontScaler15CopyGlyphBitmapEtjP6CGRectPm
    ...
    fun:_ZN9Offscreen5getCGERK19SkScalerContext_MacRK7SkGlyphtPmb
    fun:_ZN19SkScalerContext_Mac13generateImageERK7SkGlyph
 }
 {
    bug_171722_mac
@@ skipping 360 matching lines @@
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN4base17LoadNativeLibraryERKNS_8FilePathEPSs
    fun:_ZN3gfx26InitializeStaticGLBindingsENS_16GLImplementationE
    fun:_ZN3gfx9GLSurface30InitializeOneOffImplementationENS_16GLImplementationEbbb
    fun:_ZN3gfx9GLSurface24InitializeOneOffForTestsEb
    fun:_ZN7content16ContentTestSuite10InitializeEv
    fun:_ZN4base9TestSuite3RunEv
    fun:_ZN7content17UnitTestTestSuite3RunEv
 }