Remove the suppression for a NULL deref in WebKit support code

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
===================================================================
--- tools/valgrind/memcheck/suppressions.txt	(revision 128191)
+++ tools/valgrind/memcheck/suppressions.txt	(working copy)
@@ -5746,28 +5746,6 @@
    fun:_ZN47SelectFileDialogExtensionTest_SelfDeleting_Test8TestBodyEv
 }
 {
-   bug_118387a
-   Memcheck:Unaddressable
-   fun:_ZN3WTF11currentTimeEv
-   fun:_ZN7WebCore5EventC2ERKN3WTF12AtomicStringEbb
-   fun:_ZN7WebCore19PageTransitionEventC1ERKN3WTF12AtomicStringEb
-   fun:_ZN7WebCore19PageTransitionEvent6createERKN3WTF12AtomicStringEb
-   fun:_ZN7WebCore11FrameLoader11stopLoadingENS_17UnloadEventPolicyE
-   fun:_ZN7WebCore11FrameLoader8closeURLEv
-   fun:_ZN7WebCore11FrameLoader16detachFromParentEv
-   fun:_ZN7WebCore11FrameLoader13frameDetachedEv
-   fun:_ZN7WebCore8SVGImageD0Ev
-}
-{
-   bug_118387b
-   Memcheck:Unaddressable
-   fun:_ZN7WebCore15PlatformSupport20histogramEnumerationEPKcii
-   fun:_ZN7WebCore16HistogramSupport20histogramEnumerationEPKcii
-   fun:_ZN7WebCoreL27histogramMutationEventUsageERKt
-   fun:_ZN7WebCore8DocumentD2Ev
-   fun:_ZN7WebCore11SVGDocumentD0Ev
-}
-{
    bug_118890_a
    Memcheck:Leak
    ...