Disable TracingControllerTest.NotWhitelistedMetadataStripped for flakiness

content/browser/tracing/tracing_controller_browsertest.cc

Index: content/browser/tracing/tracing_controller_browsertest.cc
diff --git a/content/browser/tracing/tracing_controller_browsertest.cc b/content/browser/tracing/tracing_controller_browsertest.cc
index c3a2adc553bf700da0363a02b4bf9381b7ac842f..e778b95a89dabf0f9e35387315eaa48e0bc01c4e 100644
--- a/content/browser/tracing/tracing_controller_browsertest.cc
+++ b/content/browser/tracing/tracing_controller_browsertest.cc
@@ -382,7 +382,9 @@ IN_PROC_BROWSER_TEST_F(TracingControllerTest, DisableRecordingStoresMetadata) {
   EXPECT_TRUE(cpu_brand.length() > 0);
 }
 
-IN_PROC_BROWSER_TEST_F(TracingControllerTest, NotWhitelistedMetadataStripped) {
+// TODO(crbug.com/642991) Disabled for flakiness.
+IN_PROC_BROWSER_TEST_F(TracingControllerTest,
+                       DISABLED_NotWhitelistedMetadataStripped) {
   TestStartAndStopTracingStringWithFilter();
   // Check that a number of important keys exist in the metadata dictionary.
   EXPECT_TRUE(last_metadata() != NULL);