Fix sizing issues in the tab modal signin flow.

chrome/browser/ui/webui/signin/inline_login_handler.h

 // Copyright 2013 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_UI_WEBUI_SIGNIN_INLINE_LOGIN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SIGNIN_INLINE_LOGIN_HANDLER_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/web_ui_message_handler.h"
@@ skipping 32 matching lines @@
   // |SetExtraInitParams| to set extra init params.
   void ContinueHandleInitializeMessage();
 
   // JS callback to complete login. It calls |CompleteLogin| to do the real
   // work.
   void HandleCompleteLoginMessage(const base::ListValue* args);
 
   // JS callback to switch the UI from a constrainted dialog to a full tab.
   void HandleSwitchToFullTabMessage(const base::ListValue* args);
 
+  // Handles the web ui message sent when the navigation button is clicked by
+  // the user, requesting either a back navigation or closing the dialog.
+  void HandleNavigationButtonClicked(const base::ListValue* args);
+
   virtual void SetExtraInitParams(base::DictionaryValue& params) {}
   virtual void CompleteLogin(const base::ListValue* args) = 0;
 
   base::WeakPtrFactory<InlineLoginHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(InlineLoginHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SIGNIN_INLINE_LOGIN_HANDLER_H_