Revert of Fix leaks in exensions_unittests after enabling Oilpan

tools/valgrind/memcheck/suppressions.txt

Index: tools/valgrind/memcheck/suppressions.txt
diff --git a/tools/valgrind/memcheck/suppressions.txt b/tools/valgrind/memcheck/suppressions.txt
index c53e88919725c2a4b93c7f1f7837795467250208..b3ced04f742352e5a7e37e34205be1bc356fe4f5 100644
--- a/tools/valgrind/memcheck/suppressions.txt
+++ b/tools/valgrind/memcheck/suppressions.txt
@@ -3457,3 +3457,31 @@
    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_*
+}