Suppress memory leak in TopSitesTest

tools/heapcheck/suppressions.txt

 # There are three kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or 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 (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 917 matching lines @@
    fun:URLRequest::StartJob
    fun:URLRequest::Start
    fun:HTTPTestServer::StartGETRequest
 }
 {
    bug_49828
    Heapcheck:Leak
    ...
    fun:LoadTimingObserverTest*
 }
+{
+   bug_50103_a
+   Heapcheck:Leak
+   fun:Value::CreateNullValue
+   fun:history::TopSites::AddBlacklistedURL
+   fun:history::TopSitesTest_*_Test::TestBody
+}
+{
+   bug_50103_b
+   Heapcheck:Leak
+   fun:Value::CreateIntegerValue
+   fun:history::TopSites::AddPinnedURL
+   fun:history::TopSitesTest_PinnedURLs_Test::TestBody
+}
+