Update a suppression rule for WebCore::parseUASheet.

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 # running overnight and removing outdated bugs/suppressions.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 4641 matching lines @@
    fun:_ZN7WebCore9CSSParser10parseSheetEPNS_13CSSStyleSheetERKN3WTF6StringEiPNS3_7HashMapIPNS_12CSSStyleRuleENS3_6RefPtrINS_17CSSRuleSourceDataEEENS3_7PtrHashIS9_EENS3_10HashTraitsIS9_EENSF_ISC_EEEE
    fun:_ZN7WebCore13CSSStyleSheet17parseStringAtLineERKN3WTF6StringEbi
    fun:_ZN7WebCore12StyleElement11createSheetEPNS_7ElementEiRKN3WTF6StringE
    fun:_ZN7WebCore12StyleElement7processEPNS_7ElementE
 }
 {
    bug_107698b
    Memcheck:Leak
    fun:malloc
    ...
-   fun:_ZN7WebCore9CSSParser10parseSheetEPNS_13CSSStyleSheetERKN3WTF6StringEiPNS3_7HashMapIPNS_9StyleRuleENS3_6RefPtrINS_17CSSRuleSourceDataEEENS3_7PtrHashIS9_EENS3_10HashTraitsIS9_EENSF_ISC_EEEE
-   fun:_ZN7WebCore13CSSStyleSheet17parseStringAtLineERKN3WTF6StringE13CSSParserModei
-   fun:_ZN7WebCore13CSSStyleSheet11parseStringERKN3WTF6StringE13CSSParserMode
+   fun:_ZN3WTF10RefCountedIN7WebCore18StyleSheetInternalEEnwEm
+   fun:_ZN7WebCore18StyleSheetInternal6createEv
    fun:_ZN7WebCoreL12parseUASheetERKN3WTF6StringE
 }
 {
    bug_107699
    Memcheck:Leak
    fun:malloc
    fun:_ZN3WTF10fastMallocEm
    ...
    fun:_ZN7WebCore13AnimationBase17ensurePropertyMapEv
    fun:_ZN7WebCore13AnimationBase16getNumPropertiesEv
@@ skipping 1173 matching lines @@
    obj:/lib/libselinux.so.1
 }
 {
    bug_todo_grep
    Memcheck:Leak
    fun:malloc
    obj:/bin/grep
    obj:/bin/grep
 }