Add/widen suppressions for Mac UI valgrind bots

tools/valgrind/memcheck/suppressions.txt

 # There are three 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 # running overnight and removing outdated bugs/suppressions.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 765 matching lines @@
    fun:pthread_create@@GLIBC_2.1
    fun:_ZN42_GLOBAL__N__ZN14PlatformThread9CurrentIdEv12CreateThreadEjbPN14PlatformThread8DelegateEPm
    fun:_ZN14PlatformThread6CreateEjPNS_8DelegateEPm
    fun:_ZN4base6Thread16StartWithOptionsERKNS0_7OptionsE
    fun:_ZN18BrowserProcessImpl14CreateIOThreadEv
 }
 {
    bug_20113
    Memcheck:Leak
    fun:malloc
-   fun:_ZN3WTF10fastMallocEj
+   fun:_ZN3WTF10fastMallocE*
    ...
    fun:_ZN7WebCore16StorageNamespace23sessionStorageNamespaceEv
    fun:_ZN7WebCore4Page14sessionStorageEb
    fun:_ZNK7WebCore9DOMWindow14sessionStorageEv
-   fun:_ZN7WebCore17DOMWindowInternal24sessionStorageAttrGetterEN2v85LocalINS1_6StringEEERKNS1_12AccessorInfoE
+   fun:_ZN7WebCore17DOMWindowInternal*24sessionStorageAttrGetterEN2v85LocalINS1_6StringEEERKNS1_12AccessorInfoE
    fun:_ZN2v88internal6Object23GetPropertyWithCallbackEPS1_S2_PNS0_6StringES2_
 }
 {
    bug_20320
    Memcheck:Leak
    fun:malloc
    fun:g_malloc
    ...
    fun:gtk_accel_group_disconnect
    fun:gtk_accel_group_disconnect_key
@@ skipping 289 matching lines @@
 }
 {
    bug_24936
    Memcheck:Free
    fun:_ZdlPv
    fun:_ZN7WebCore15CSSSelectorList19adoptSelectorVectorERN3WTF6VectorIPNS_11CSSSelectorELj0EEE
    fun:_ZN7WebCore9CSSParser15createStyleRuleEPN3WTF6VectorIPNS_11CSSSelectorELj0EEE
    fun:_Z10cssyyparsePv
    fun:_ZN7WebCore9CSSParser10parseSheetEPNS_13CSSStyleSheetERKNS_6StringE
 }