Add memcheck annotation and remove suppression.

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 # running overnight and removing outdated bugs/suppressions.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 5305 matching lines @@
    fun:_ZN7WebCore8Document36updateLayoutIgnorePendingStylesheetsEv
    fun:_ZN7WebCore19ReplacementFragment30insertFragmentForTestRenderingEPNS_4NodeE
    fun:_ZN7WebCore19ReplacementFragmentC1EPNS_8DocumentEPNS_16DocumentFragmentEbRKNS_16VisibleSelectionE
    fun:_ZN7WebCore23ReplaceSelectionCommand7doApplyEv
    fun:_ZN7WebCore11EditCommand5applyEv
    fun:_ZN7WebCore12applyCommandEN3WTF10PassRefPtrINS_11EditCommandEEE
    fun:_ZN7WebCoreL21executeInsertFragmentEPNS_5FrameEN3WTF10PassRefPtrINS_16DocumentFragmentEEE
    fun:_ZN7WebCoreL17executeInsertHTMLEPNS_5FrameEPNS_5EventENS_19EditorCommandSourceERKN3WTF6StringE
 }
 {
-   bug_106326
-   Memcheck:Uninitialized
-   fun:_ZN15tracked_objects9DeathData11RecordDeathEiii
-   fun:_ZN15tracked_objects10ThreadData11TallyADeathERKNS_6BirthsEii
-   fun:_ZN15tracked_objects10ThreadData31TallyRunOnNamedThreadIfTrackingERKN4base12TrackingInfoERKNS_11TrackedTimeES7_
-}
-{
    bug_106331
    Memcheck:Leak
    fun:_Znw*
    fun:_ZN9Extension6CreateERK8FilePathNS_8LocationERKN4base15DictionaryValueEiPSs
 }
 
 #-----------------------------------------------------------------------
 # 4. These only occur on our Google workstations
 {
    bug_todo_freeres
@@ skipping 22 matching lines @@
    obj:/lib/libselinux.so.1
    obj:/lib/libselinux.so.1
 }
 {
    bug_todo_grep
    Memcheck:Leak
    fun:malloc
    obj:/bin/grep
    obj:/bin/grep
 }