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

content/shell/shell.cc

 // 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.
 
 #include "content/shell/shell.h"
 
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "content/browser/tab_contents/navigation_controller.h"
@@ skipping 59 matching lines @@
 
   if (!url.is_empty())
     shell->LoadURL(url);
   return shell;
 }
 
 void Shell::LoadURL(const GURL& url) {
   tab_contents_->controller().LoadURL(
       url,
       GURL(),
-      PageTransition::TYPED,
+      content::PAGE_TRANSITION_TYPED,
       std::string());
   tab_contents_->Focus();
 }
 
 void Shell::GoBackOrForward(int offset) {
   tab_contents_->controller().GoToOffset(offset);
   tab_contents_->Focus();
 }
 
 void Shell::Reload() {
@@ skipping 28 matching lines @@
 void Shell::DidNavigateMainFramePostCommit(TabContents* tab) {
   PlatformSetAddressBarURL(tab->GetURL());
 }
 
 void Shell::UpdatePreferredSize(TabContents* source,
                                 const gfx::Size& pref_size) {
   PlatformSizeTo(pref_size.width(), pref_size.height());
 }
 
 }  // namespace content