Add suppression for nother sql variation

BUG=20653
TEST=Mac Valgrind UI bots

Review URL: http://codereview.chromium.org/199062

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@25868 0039d316-1c4b-4281-b951-d872f2087c98

tools/valgrind/memcheck/suppressions_mac.txt

@@ -573,6 +573,12 @@
    ...
    fun:sqlite3_exec
 }
+{
+   bug_20653c
+   Memcheck:Addr4
+   fun:pager_write_pagelist
+   fun:sqlite3PagerCommitPhaseOne
+}
 {
    bug_20808
    Memcheck:Addr8