Update from chromium https://crrev.com/304586

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 # running overnight and removing outdated bugs/suppressions.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 176 matching lines @@
 {
   bug_340726
   Memcheck:Leak
   fun:_Znw*
   fun:_ZN4base17LoadNativeLibrary*
   fun:_ZN3gfx26InitializeStaticGLBindings*
   fun:_ZN3gfx9GLSurface30InitializeOneOffImplementation*
   fun:_ZN3gfx9GLSurface24InitializeOneOffForTestsEv
 }
 {
+   bug_380568
+   Memcheck:Leak
+   fun:calloc
+   fun:_internal_class_createInstanceFromZone
+   fun:_internal_class_createInstance
+   fun:NSAllocateObject
+   fun:+[NSObject(NSObject) alloc]
+   fun:-[VideoCaptureDeviceQTKit initWithFrameReceiver:]
+   fun:_ZN5media21VideoCaptureDeviceMac4InitENS_18VideoCaptureDevice4Name14CaptureApiTypeE
+   fun:_ZN5media28VideoCaptureDeviceFactoryMac6CreateERKNS_18VideoCaptureDevice4NameE
+   fun:_ZN5media45VideoCaptureDeviceTest_OpenInvalidDevice_Test8TestBodyEv
+}
+{
    bug_385604_b
    Memcheck:Leak
    fun:calloc
    fun:_ZN18hb_object_header_t6createEj
    fun:_ZL16hb_object_createI9hb_face_tEPT_v
    fun:hb_face_create_for_tables
    fun:_ZN3gfx12_GLOBAL__N_118CreateHarfBuzzFaceEP10SkTypeface
    fun:_ZN3gfx12_GLOBAL__N_118CreateHarfBuzzFontEP10SkTypefacei
    fun:_ZN3gfx18RenderTextHarfBuzz8ShapeRunEPNS_8internal15TextRunHarfBuzzE
    fun:_ZN3gfx18RenderTextHarfBuzz12EnsureLayoutEv
    fun:_ZN3gfx41RenderTextTest_HarfBuzz_RunDirection_Test8TestBodyEv
 }
 {
    bug_416957
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN9__gnu_cxx13new_allocatorISt13_Rb_tree_nodeISt4pairIKPKN15tracked_objects6BirthsENS3_9DeathDataEEEE8allocateEmPKv
    fun:_ZNSt8_Rb_treeIPKN15tracked_objects6BirthsESt4pairIKS3_NS0_9DeathDataEESt10_Select1stIS7_ESt4lessIS3_ESaIS7_EE11_M_get_nodeEv
    fun:_ZNSt8_Rb_treeIPKN15tracked_objects6BirthsESt4pairIKS3_NS0_9DeathDataEESt10_Select1stIS7_ESt4lessIS3_ESaIS7_EE14_M_create_nodeERKS7_
    fun:_ZNSt8_Rb_treeIPKN15tracked_objects6BirthsESt4pairIKS3_NS0_9DeathDataEESt10_Select1stIS7_ESt4lessIS3_ESaIS7_EE9_M_insertEPSt18_Rb_tree_node_baseSF_RKS7_
    fun:_ZNSt8_Rb_treeIPKN15tracked_objects6BirthsESt4pairIKS3_NS0_9DeathDataEESt10_Select1stIS7_ESt4lessIS3_ESaIS7_EE16_M_insert_uniqueESt17_Rb_tree_iteratorIS7_ERKS7_
    fun:_ZNSt3mapIPKN15tracked_objects6BirthsENS0_9DeathDataESt4lessIS3_ESaISt4pairIKS3_S4_EEE6insertESt17_Rb_tree_iteratorIS9_ERKS9_
    fun:_ZNSt3mapIPKN15tracked_objects6BirthsENS0_9DeathDataESt4lessIS3_ESaISt4pairIKS3_S4_EEEixERS8_
    fun:_ZN15tracked_objects10ThreadData11TallyADeathERKNS_6BirthsEiRKNS_13TaskStopwatchE
    fun:_ZN15tracked_objects10ThreadData31TallyRunOnNamedThreadIfTrackingERKN4base12TrackingInfoERKNS_13TaskStopwatchE
 }
-
+{
+   bug_431906
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN7content21PluginLoaderPosixTestC2Ev
+   fun:_ZN7content45PluginLoaderPosixTest_PluginLaunchFailed_TestC2Ev
+   fun:_ZN7content45PluginLoaderPosixTest_PluginLaunchFailed_TestC1Ev
+   fun:_ZN7testing8internal15TestFactoryImplIN7content45PluginLoaderPosixTest_PluginLaunchFailed_TestEE10CreateTestEv
+}