Move ClosePage() from RenderViewHost to WebContents.

content/public/browser/render_view_host.h

Index: content/public/browser/render_view_host.h
diff --git a/content/public/browser/render_view_host.h b/content/public/browser/render_view_host.h
index 05bac140f0da4ec38253b40b86ad0babf7929339..5909d286f41fde172a1777fa6976dd944886645b 100644
--- a/content/public/browser/render_view_host.h
+++ b/content/public/browser/render_view_host.h
@@ -83,11 +83,6 @@ class CONTENT_EXPORT RenderViewHost : virtual public RenderWidgetHost {
   // Returns true if the current focused element is editable.
   virtual bool IsFocusedElementEditable() = 0;
 
-  // Causes the renderer to close the current page, including running its
-  // onunload event handler.  A ClosePage_ACK message will be sent to the
-  // ResourceDispatcherHost when it is finished.
-  virtual void ClosePage() = 0;
-
   // Copies the image at location x, y to the clipboard (if there indeed is an
   // image at that location).
   virtual void CopyImageAt(int x, int y) = 0;