Add suppression for another sql variation

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 # running overnight and removing outdated bugs/suppressions.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 556 matching lines @@
    fun:pager_truncate_cache
    fun:pager_truncate
    fun:pager_playback
    fun:sqlite3PagerRollback
    fun:sqlite3BtreeRollback
    fun:sqlite3RollbackAll
    ...
    fun:sqlite3_exec
 }
 {
+   bug_20653c
+   Memcheck:Addr4
+   fun:pager_write_pagelist
+   fun:sqlite3PagerCommitPhaseOne
+}
+{
    bug_20808
    Memcheck:Addr8
    ...
    fun:CGContextDrawLayerAtPoint
    fun:-[RenderWidgetHostViewCocoa drawRect:]
 }
 {
    bug_20814
    Memcheck:Addr4
    fun:_ZN10CLVContextC2EPKvm
@@ skipping 152 matching lines @@
    fun:-[NSFont boundingRectForGlyph:]
 }
 {
    bug_21286
    Memcheck:Leak
    fun:_Znw*
    fun:sendSimpleEventToSelf
    fun:aeInitializeFromHIToolbox
    fun:INIT_AppleEvents
 }