suppress memory leak from SelectFileDialogExtensionTest

tools/valgrind/memcheck/suppressions.txt

 # There are four kinds of suppressions in this file.
 # 1. third party stuff we have no control over
 #
 # 2. intentional unit test errors, or 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 (but a few aren't yet).
 # Periodically we should sweep this file and the bug tracker clean by
 # running overnight and removing outdated bugs/suppressions.
@@ skipping 5933 matching lines @@
 }
 {
    bug_118203
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN12invalidation20NewPermanentCallbackINS_22InvalidationClientImplES1_St4pairINS_6StatusESsEEEPN4base8CallbackIFvT1_EEEPT_MT0_FvS7_E
    fun:_ZN12invalidation22InvalidationClientImpl34ScheduleStartAfterReadingStateBlobEv
    fun:_ZN12invalidation22InvalidationClientImpl5StartEv
    fun:_ZN13sync_notifier24ChromeInvalidationClient5StartERKSsS2_S2_RKSt3mapIN8syncable9ModelTypeElSt4lessIS5_ESaISt4pairIKS5_lEEERKN12browser_sync10WeakHandleINS_26InvalidationVersionTrackerEEEPNS0_8ListenerEPNS_11StateWriterEN4base7WeakPtrIN4buzz23XmppTaskParentInterfaceEEE
 }
+{
+   bug_118336
+   Memcheck:Leak
+   fun:_Znw*
+   ...
+   fun:_ZN47SelectFileDialogExtensionTest_SelfDeleting_Test8TestBodyEv
+}
 
 #-----------------------------------------------------------------------
 # 4. These only occur on our Google workstations
 
 {
    bug_todo_getdelim
    Memcheck:Leak
    fun:malloc
    fun:getdelim
    ...
@@ skipping 16 matching lines @@
    obj:/bin/grep
    obj:/bin/grep
 }
 {
    bug_117789
    Memcheck:Uninitialized
    fun:_ZN2v88internal4Heap14CollectGarbageENS0_15AllocationSpaceENS0_16GarbageCollectorEPKcS5_
    fun:_ZN2v88internal4Heap14CollectGarbageENS0_15AllocationSpaceEPKc
    ...
 }