Suppressing leaks in MockQuotaManagerPorxy

TBR=kinuko@chromium.org
BUG=83944
TEST=heapcheck should cycle green

Review URL: http://codereview.chromium.org/7008017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86700 0039d316-1c4b-4281-b951-d872f2087c98

tools/heapcheck/suppressions.txt

@@ -1610,3 +1610,10 @@
    fun:net::ClientSocketPoolManager::InitSocketHandleForRawConnect
    fun:notifier::ProxyResolvingClientSocket::ProcessProxyResolveDone
 }
+{
+   bug_83944
+   Heapcheck:Leak
+   ...
+   fun:fileapi::FileSystemTestOriginHelper::SetUp
+   fun:fileapi::FileSystemOperationTest::SetUp
+}