Move PageTransition into content namespace. While I'm touching all these files, I've also updated...

chrome/browser/chromeos/login/registration_screen.h

 // Copyright (c) 2011 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_REGISTRATION_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_REGISTRATION_SCREEN_H_
 #pragma once
 
 #include <string>
 
@@ skipping 69 matching lines @@
 
  private:
   // ViewScreen implementation:
   virtual void CreateView();
   virtual void Refresh();
   virtual RegistrationView* AllocateView();
 
   // TabContentsDelegate implementation:
   // Deprecated. Please use two-argument variant.
   // TODO(adriansc): Remove this method once refactoring changed all call sites.
-  virtual TabContents* OpenURLFromTab(TabContents* source,
-                                      const GURL& url,
-                                      const GURL& referrer,
-                                      WindowOpenDisposition disposition,
-                                      PageTransition::Type transition) OVERRIDE;
+  virtual TabContents* OpenURLFromTab(
+      TabContents* source,
+      const GURL& url,
+      const GURL& referrer,
+      WindowOpenDisposition disposition,
+      content::PageTransition transition) OVERRIDE;
   virtual TabContents* OpenURLFromTab(TabContents* source,
                                       const OpenURLParams& params) OVERRIDE;
 
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
 
   // WebPageScreen implementation:
   virtual void CloseScreen(ScreenObserver::ExitCodes code);
 
   // Url of account creation page. Overriden by tests.
   static scoped_ptr<GURL> host_page_url_;
 
   DISALLOW_COPY_AND_ASSIGN(RegistrationScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_REGISTRATION_SCREEN_H_