Make input event forwarding work in --site-per-process.

Source/core/page/ChromeClient.h

Index: Source/core/page/ChromeClient.h
diff --git a/Source/core/page/ChromeClient.h b/Source/core/page/ChromeClient.h
index 9b6276f34ed6a45d9f7c8382086cf3824b86443e..e967a58dbf2b0618f817757998bd94fb2e228cb7 100644
--- a/Source/core/page/ChromeClient.h
+++ b/Source/core/page/ChromeClient.h
@@ -62,6 +62,7 @@ class Node;
 class Page;
 class PagePopupDriver;
 class PopupMenuClient;
+class RemoteFrame;
 
 struct CompositedSelectionBound;
 struct DateTimeChooserParameters;
@@ -225,7 +226,7 @@ public:
 
     // FIXME: Remove this method once we have input routing in the browser
     // process. See http://crbug.com/339659.
-    virtual void forwardInputEvent(blink::Frame*, blink::Event*) { }
+    virtual void forwardInputEvent(RemoteFrame*, Event*) { }
 
     // Input mehtod editor related functions.
     virtual void didCancelCompositionOnSelectionChange() { }