Revert of Fix leaks in exensions_unittests after enabling Oilpan

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 # running overnight and removing outdated bugs/suppressions.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 3439 matching lines @@
    fun:_ZN5blink14DocumentLoader10commitDataEPKcm
    fun:_ZN5blink14DocumentLoader15finishedLoadingEd
    fun:_ZN5blink14DocumentLoader14maybeLoadEmptyEv
    fun:_ZN5blink14DocumentLoader24startLoadingMainResourceEv
    fun:_ZN5blink11FrameLoader4initEv
    fun:_ZN5blink10LocalFrame4initEv
    fun:_ZN5blink17WebLocalFrameImpl19initializeCoreFrameEPNS_9FrameHostEPNS_10FrameOwnerERKN3WTF12AtomicStringES8_
    fun:_ZN5blink11WebViewImpl12setMainFrameEPNS_8WebFrameE
    fun:_ZN10extensions14ScopedWebFrameC1Ev
 }
+{
+   bug_581092_a
+   Memcheck:Leak
+   ...
+   fun:_ZN5blink15ContextFeatures13defaultSwitchEv
+   fun:_ZN5blink8DocumentC2ERKNS_12DocumentInitEh
+   fun:_ZN5blink12HTMLDocumentC1ERKNS_12DocumentInitEh
+   fun:_ZN5blink12HTMLDocument6createERKNS_12DocumentInitE
+   fun:_ZN5blink17DOMImplementation14createDocumentERKN3WTF6StringERKNS_12DocumentInitEb
+   fun:_ZN5blink14LocalDOMWindow14createDocumentERKN3WTF6StringERKNS_12DocumentInitEb
+   fun:_ZN5blink14LocalDOMWindow18installNewDocumentERKN3WTF6StringERKNS_12DocumentInitEb
+   fun:_ZN5blink14DocumentLoader15createWriterForEPKNS_*
+}
+{
+   bug_581092_b
+   Memcheck:Leak
+   fun:_Znw*
+   fun:_ZN5blink26RefCountedGarbageCollectedINS_15StyleFilterDataEE13makeKeepAliveEv
+   fun:_ZN5blink26RefCountedGarbageCollectedINS_15StyleFilterDataEE3refEv
+   ...
+   fun:_ZN5blink7DataRefINS_15StyleFilterDataEE4initEv
+   ...
+   fun:_ZN5blink13ComputedStyle6createEv
+   fun:_ZN5blink13StyleResolver16styleForDocumentERNS_8DocumentE
+   fun:_ZN5blink8Document6attachERKNS_4Node13AttachContextE
+   fun:_ZN5blink14LocalDOMWindow18installNewDocumentERKN3WTF6StringERKNS_12DocumentInitEb
+   fun:_ZN5blink14DocumentLoader15createWriterForEPKNS_*
+}