cros: Bind hangup red button on remote controller to close web dialog

chrome/browser/chromeos/login/ui/login_web_dialog.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_WEB_DIALOG_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_WEB_DIALOG_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 57 matching lines @@
   // NOTE: This function deletes this object at the end.
   void OnDialogClosed(const std::string& json_retval) override;
   void OnCloseContents(content::WebContents* source,
                        bool* out_close_dialog) override;
   bool ShouldShowDialogTitle() const override;
   bool HandleContextMenu(const content::ContextMenuParams& params) override;
   bool HandleOpenURLFromTab(content::WebContents* source,
                             const content::OpenURLParams& params,
                             content::WebContents** out_new_contents) override;
   bool HandleShouldCreateWebContents() override;
+  bool AdditionalAccelerator(const ui::Accelerator& accelerator) const override;
 
  private:
   content::BrowserContext* const browser_context_;
   gfx::NativeWindow parent_window_;
   // Notifications receiver.
   Delegate* const delegate_;
 
   base::string16 title_;
   const GURL url_;
   bool is_open_;
 
   // Dialog display size.
   int width_;
   int height_;
 
   DISALLOW_COPY_AND_ASSIGN(LoginWebDialog);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_UI_LOGIN_WEB_DIALOG_H_