Valgrind: Update suppression after r71537.

BUG=65664
TEST=Valgind Webkit goes green
TBR=scherkus
Review URL: http://codereview.chromium.org/6344003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@71550 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions.txt

@@ -3388,7 +3388,7 @@
    bug_65664c
    Memcheck:Leak
    fun:_Znw*
-   fun:_ZN11webkit_glue20SimpleDataSourceTest20InitializeDataSourceEPKc
+   fun:_ZN11webkit_glue20SimpleDataSourceTest20InitializeDataSourceEPKcPN5media12MockCallbackE
    fun:_ZN11webkit_glue*SimpleDataSourceTest*
 }
 {