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

chrome/browser/ui/views/dom_view.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 "chrome/browser/ui/views/dom_view.h"
 
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/renderer_preferences_util.h"
 #include "chrome/browser/ui/views/tab_contents/tab_contents_view_views.h"
 #include "content/browser/tab_contents/tab_contents.h"
@@ skipping 36 matching lines @@
 }
 
 TabContents* DOMView::CreateTabContents(Profile* profile,
                                         SiteInstance* instance) {
   return new TabContents(profile, instance, MSG_ROUTING_NONE, NULL, NULL);
 }
 
 void DOMView::LoadURL(const GURL& url) {
   DCHECK(initialized_);
   dom_contents_->tab_contents()->controller().LoadURL(
-      url, GURL(), PageTransition::START_PAGE, std::string());
+      url, GURL(), content::PAGE_TRANSITION_START_PAGE, std::string());
 }
 
 bool DOMView::SkipDefaultKeyEventProcessing(const views::KeyEvent& e) {
   // Don't move the focus to the next view when tab is pressed, we want the
   // key event to be propagated to the render view for doing the tab traversal
   // there.
   return views::FocusManager::IsTabTraversalKeyEvent(e);
 }
 
 void DOMView::OnFocus() {
@@ skipping 15 matching lines @@
   if (views::Widget::IsPureViews()) {
     TabContentsViewViews* widget = static_cast<TabContentsViewViews*>(
         dom_contents_->tab_contents()->view());
     views::NativeWidgetViews* nwv =
         static_cast<views::NativeWidgetViews*>(widget->native_widget());
     AttachToView(nwv->GetView());
   } else {
     Attach(dom_contents_->tab_contents()->GetNativeView());
   }
 }