Suppress one uninit and widen a few suppressions to make the WebKit/Mac bot greener

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 # running overnight and removing outdated bugs/suppressions.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 1851 matching lines @@
 {
    bug_102327_b
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN15tracked_objects10ThreadData10InitializeEv
    fun:_ZN15tracked_objects10ThreadData23InitializeThreadContextERKSs
 }
 {
    bug_102621
    Memcheck:Uninitialized
-   fun:NSHFSTypeCodeFromFileType
+   ...
    fun:-[NSPasteboard(ChimeraPasteboardURLUtils) getURLs:andTitles:convertingFilenames:]
    fun:_ZN2ui33PopulateURLAndTitleFromPasteboardEP4GURLPSbItN4base20string16_char_traitsESaItEEP12NSPasteboarda
    fun:_ZN24WebDragDestTest_URL_Test8TestBodyEv
 }
 {
    bug_104756
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN3IPC11SyncMessage13GenerateReplyEPKNS_7MessageE
    fun:_ZN3IPC17SyncMessageSchemaI6Tuple1IbES1_IRSt6vectorIN6webkit13WebPluginInfoESaIS5_EEEE32DispatchDelayReplyWithSendParamsI19RenderMessageFilterMSC_FvbPNS_7MessageEEEEbbRKS2_PKSD_PT_T0_
@@ skipping 19 matching lines @@
 {
    bug_105022
    Memcheck:Leak
    fun:malloc_zone_malloc
    fun:malloc_set_zone_name
    fun:init__zone0
    fun:setenv$UNIX2003
    fun:_ZN12_GLOBAL__N_115EnvironmentImpl10SetVarImplEPKcRKSs
    fun:_ZN12_GLOBAL__N_115EnvironmentImpl6SetVarEPKcRKSs
    fun:_Z18AppendToPythonPathRK8FilePath
-   fun:_ZNK3net15LocalTestServer13SetPythonPathEv
+   fun:_ZN*3net15LocalTestServer13SetPythonPathEv
    fun:_ZN3net15LocalTestServer5StartEv
    fun:_ZN12_GLOBAL__N_132MimeTypeTests_MimeTypeTests_Test8TestBodyEv
 }
 {
    bug_105323
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN15tracked_objects10ThreadData3GetEv
    fun:_ZN15tracked_objects10ThreadData32TallyRunOnWorkerThreadIfTrackingEPKNS_6BirthsERKNS_11TrackedTimeES6_S6_
    fun:_ZN4base12_GLOBAL__N_112WorkerThread10ThreadMainEv
@@ skipping 454 matching lines @@
    fun:_ZN2v88internalL6InvokeEbNS0_6HandleINS0_10JSFunctionEEENS1_INS0_6ObjectEEEiPS5_Pb
    fun:_ZN2v88internal9Execution4CallENS0_6HandleINS0_6ObjectEEES4_iPS4_Pbb
    fun:_ZN2v88Function4CallENS_6HandleINS_6ObjectEEEiPNS1_INS_5ValueEEE
    fun:_ZN7WebCore7V8Proxy24instrumentedCallFunctionEPNS_5FrameEN2v86HandleINS3_8FunctionEEENS4_INS3_6ObjectEEEiPNS4_INS3_5ValueEEE
    fun:_ZN7WebCore7V8Proxy12callFunctionEN2v86HandleINS1_8FunctionEEENS2_INS1_6ObjectEEEiPNS2_INS1_5ValueEEE
    fun:_ZN7WebCore19V8LazyEventListener20callListenerFunctionEPNS_22ScriptExecutionContextEN2v86HandleINS3_5ValueEEEPNS_5EventE
    fun:_ZN7WebCore23V8AbstractEventListener18invokeEventHandlerEPNS_22ScriptExecutionContextEPNS_5EventEN2v86HandleINS5_5ValueEEE
    fun:_ZN7WebCore23V8AbstractEventListener11handleEventEPNS_22ScriptExecutionContextEPNS_5EventE
    fun:_ZN7WebCore11EventTarget18fireEventListenersEPNS_5EventEPNS_15EventTargetDataERN3WTF6VectorINS_23RegisteredEventListenerELm1EEE
 }