Oilpan: promptly dispose style resolvers upon clearing.

third_party/WebKit/Source/core/css/resolver/StyleResolver.h

Index: third_party/WebKit/Source/core/css/resolver/StyleResolver.h
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleResolver.h b/third_party/WebKit/Source/core/css/resolver/StyleResolver.h
index 768cc3658e7bb6e8bcfc6649682d014ebd95c85a..10a0f45fb5d879cdb71493cc32c10d69ae431f8c 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleResolver.h
+++ b/third_party/WebKit/Source/core/css/resolver/StyleResolver.h
@@ -80,13 +80,17 @@ using ActiveInterpolationsMap = HashMap<PropertyHandle, Vector<RefPtr<Interpolat
 
 // This class selects a ComputedStyle for a given element based on a collection of stylesheets.
 class CORE_EXPORT StyleResolver final : public NoBaseWillBeGarbageCollectedFinalized<StyleResolver> {
-    WTF_MAKE_NONCOPYABLE(StyleResolver); WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(StyleResolver);
+    WTF_MAKE_NONCOPYABLE(StyleResolver);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(StyleResolver);
 public:
     static PassOwnPtrWillBeRawPtr<StyleResolver> create(Document& document)
     {
         return adoptPtrWillBeNoop(new StyleResolver(document));
     }
     ~StyleResolver();
+#if ENABLE(OILPAN)
+    void dispose();
+#endif
 
     // FIXME: StyleResolver should not be keeping tree-walk state.
     // These should move to some global tree-walk state, or should be contained in a