Valgrind: try to remove a suppression for V8 Profiler::Engage.

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 # running overnight and removing outdated bugs/suppressions.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 1037 matching lines @@
    fun:_ZN11ChildThread17OnMessageReceivedERKN3IPC7MessageE
    fun:_ZN3IPC12ChannelProxy7Context17OnDispatchMessageERKNS_7MessageE
    fun:_Z16DispatchToMethodIN3IPC12ChannelProxy7ContextEMS2_FvRKNS0_7MessageEES3_EvPT_T0_RK6Tuple1IT1_E
    fun:_ZN14RunnableMethodIN3IPC12ChannelProxy7ContextEMS2_FvRKNS0_7MessageEE6Tuple1IS3_EE3RunEv
    fun:_ZN11MessageLoop7RunTaskEP4Task
    fun:_ZN11MessageLoop21DeferOrRunPendingTaskERKNS_11PendingTaskE
    fun:_ZN11MessageLoop6DoWorkEv
    fun:_ZN4base18MessagePumpDefault3RunEPNS_11MessagePump8DelegateE
 }
 {
-   bug_24503
-   Memcheck:Leak
-   fun:calloc
-   fun:allocate_dtv
-   fun:_dl_allocate_tls
-   fun:pthread_create@@GLIBC_2.1
-   fun:_ZN2v88internal6Thread5StartEv
-   fun:_ZN2v88internal8Profiler6EngageEv
-   fun:_ZN2v88internal6Logger5SetupEv
-   fun:_ZN2v88internal2V810InitializeEPNS0_12DeserializerE
-   fun:_ZN2v88internal8Snapshot11DeserializeEPKhi
-   fun:_ZN2v88internal8Snapshot10InitializeEPKc
-   fun:_ZN2v82V810InitializeEv
-}
-{
    bug_24936
    Memcheck:Free
    fun:_ZdlPv
    fun:_ZN7WebCore15CSSSelectorList19adoptSelectorVectorERN3WTF6VectorIPNS_11CSSSelectorELj0EEE
    fun:_ZN7WebCore9CSSParser15createStyleRuleEPN3WTF6VectorIPNS_11CSSSelectorELj0EEE
    fun:_Z10cssyyparsePv
    fun:_ZN7WebCore9CSSParser10parseSheetEPNS_13CSSStyleSheetERKNS_6StringE
 }
 {
    bug_26216
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN9Extension25LoadExtensionActionHelperEPK15DictionaryValuePSs
    fun:_ZN39ExtensionTest_LoadPageActionHelper_Test8TestBodyEv
 }