Fix memory leak caused by Rules Registries

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 # running overnight and removing outdated bugs/suppressions.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 5352 matching lines @@
    fun:_ZN7WebCoreL12parseUASheetEPKcj
    fun:_ZN7WebCoreL19loadViewSourceStyleEv
    fun:_ZN7WebCore16CSSStyleSelector12matchUARulesERNS0_11MatchResultE
    fun:_ZN7WebCore16CSSStyleSelector15styleForElementEPNS_7ElementEPNS_11RenderStyleENS_20StyleSharingBehaviorENS_20RuleMatchingBehaviorEPNS_12RenderRegionE
    fun:_ZN7WebCore16CSSStyleSelectorC1EPNS_8DocumentEb
    fun:_ZN7WebCore8Document19createStyleSelectorEv
    fun:_ZN7WebCore8Document13styleSelectorEv
    fun:_ZN7WebCore7Element16styleForRendererEv
 }
 {
-   bug_122130
-   Memcheck:Leak
-   fun:_Znw*
-   fun:_ZN10extensions20RulesRegistryService30RegisterDefaultRulesRegistriesEv
-   fun:_ZN19ExtensionSystemImpl6Shared4InitEb
-   fun:_ZN19ExtensionSystemImpl4InitEb
-   fun:_ZN14ProfileManager22DoFinalInitForServicesEP7Profileb
-   fun:_ZN14ProfileManager11DoFinalInitEP7Profileb
-   fun:_ZN14ProfileManager10AddProfileEP7Profile
-   fun:_ZN14ProfileManager*GetProfileERK8FilePath
-   fun:_ZN14ProfileManager*Get*ProfileERK8FilePath
-}
-{
    bug_122177
    Memcheck:Leak
    ...
    fun:_ZN7history16InMemoryURLIndex23PostSaveToCacheFileTaskEv
    fun:_ZN7history16InMemoryURLIndex8ShutDownEv
    fun:_ZN14HistoryService13UnloadBackendEv
    fun:_ZN14HistoryService7CleanupEv
 }
 {
    bug_122189
@@ skipping 405 matching lines @@
    obj:/lib/libselinux.so.1
 }
 {
    bug_todo_grep
    Memcheck:Leak
    fun:malloc
    obj:/bin/grep
    obj:/bin/grep
 }