Suppress occasional SQL leaks in appcache::PrepareCachedStatement()....

tools/valgrind/memcheck/suppressions_mac.txt

 # There are three kinds of suppressions in this file:
 # 1. Third party stuff we have no control over.
 #
 # 2. Intentional unit test errors, 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.
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 1190 matching lines @@
 }
 {
    bug_66102_b
    Memcheck:Leak
    fun:_Znw*
    ...
    fun:_ZN6policy21FileBasedPolicyLoader16InitOnFileThreadEv
    ...
    fun:_ZN54PrefValueStorePolicyRefreshTest_TestPolicyRefresh_Test8TestBodyEv
 }
-
+{
+   bug_67261
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN3sql10Connection18GetUniqueStatementEPKc
+   fun:_ZN3sql10Connection18GetCachedStatementERKNS_11StatementIDEPKc
+   fun:_ZN8appcache16AppCacheDatabase22PrepareCachedStatementERKN3sql11StatementIDEPKcPNS1_9StatementE
+}