Refactoring: Get rid of isDocument() check in EventTarget.

Source/core/dom/Document.h

Index: Source/core/dom/Document.h
diff --git a/Source/core/dom/Document.h b/Source/core/dom/Document.h
index 406082cb596cc445d9d3bc391812e037684b7cf5..361a665030fd0ef2c77e6e08a39725bb3995c0ce 100644
--- a/Source/core/dom/Document.h
+++ b/Source/core/dom/Document.h
@@ -1029,6 +1029,9 @@ public:
 
     virtual void addConsoleMessage(MessageSource, MessageLevel, const String& message, unsigned long requestIdentifier = 0);
 
+    virtual DOMWindow* browsingContext() OVERRIDE { return domWindow(); }

[abarth-chromium, 2013/08/09 16:25:53]

This terminology doesn't match the HTML5 spec.   The term "browsing context" in
the HTML5 spec corresponds to Frame in Blink.

+    virtual void userEventWasHandled() OVERRIDE { resetLastHandledUserGestureTimestamp(); }
+
     PassRefPtr<FontLoader> fontloader();
     DocumentLifecycleNotifier* lifecycleNotifier();