Remove two functions on WebContentsDelegate which didn't belong in content. They were only called f…

ui/web_dialogs/web_dialog_web_contents_delegate.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/web_dialogs/web_dialog_web_contents_delegate.h"
 
 #include "base/logging.h"
 #include "content/public/browser/web_contents.h"
 
 using content::BrowserContext;
@@ skipping 37 matching lines @@
                            initial_pos, user_gesture);
 }
 
 bool WebDialogWebContentsDelegate::IsPopupOrPanel(
     const WebContents* source) const {
   // This needs to return true so that we are allowed to be resized by our
   // contents.
   return true;
 }
 
-bool WebDialogWebContentsDelegate::ShouldAddNavigationToHistory(
-    const history::HistoryAddPageArgs& add_page_args,
-    content::NavigationType navigation_type) {
-  return false;
-}
-
 }  // namespace ui