Implement WindowEventHandlers

Source/core/frame/WindowEventHandlers.idl

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-/* Default styles for XHTML Mobile Profile documents where they differ from html.css */
-
-@viewport {
-    width: auto;
-    /* Ideally these should be removed. Currently here to avoid test result regressions. */
-    min-zoom: 0.25;
-    max-zoom: 5;
-}
+[
+    NoInterfaceObject,
+    ImplementedAs=DOMWindowEventHandlers
+] interface WindowEventHandlers {
+    //attribute EventHandler onafterprint;
+    //attribute EventHandler onbeforeprint;
+    attribute EventHandler onbeforeunload;
+    attribute EventHandler onhashchange;
+    attribute EventHandler onmessage;
+    attribute EventHandler onoffline;
+    attribute EventHandler ononline;
+    attribute EventHandler onpagehide;
+    attribute EventHandler onpageshow;
+    attribute EventHandler onpopstate;
+    attribute EventHandler onresize;
+    attribute EventHandler onstorage;
+    attribute EventHandler onunload;
+};