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

tools/valgrind/memcheck/suppressions_mac.txt

Index: tools/valgrind/memcheck/suppressions_mac.txt
diff --git a/tools/valgrind/memcheck/suppressions_mac.txt b/tools/valgrind/memcheck/suppressions_mac.txt
index 154e4e99bc12630fa096b7a48b29931bb70c511d..4ae5e478530b5b53b6b6e261fec7c9e50df70495 100644
--- a/tools/valgrind/memcheck/suppressions_mac.txt
+++ b/tools/valgrind/memcheck/suppressions_mac.txt
@@ -194,6 +194,19 @@
   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
@@ -220,4 +233,12 @@
    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
+}