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

chrome/browser/ui/cocoa/html_dialog_window_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/html_dialog_window_controller.h"
 
 #include "base/logging.h"
 #include "base/memory/scoped_nsobject.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 269 matching lines @@
       delegate_->profile(), NULL, MSG_ROUTING_NONE, NULL, NULL));
   [[self window] setContentView:tabContents_->GetNativeView()];
   tabContents_->set_delegate(delegate_.get());
 
   // This must be done before loading the page; see the comments in
   // HtmlDialogUI.
   HtmlDialogUI::GetPropertyAccessor().SetProperty(tabContents_->property_bag(),
                                                   delegate_.get());
 
   tabContents_->controller().LoadURL(delegate_->GetDialogContentURL(),
-                                      GURL(), PageTransition::START_PAGE,
+                                      GURL(),
+                                      content::PAGE_TRANSITION_START_PAGE,
                                       std::string());
 
   // TODO(akalin): add accelerator for ESC to close the dialog box.
   //
   // TODO(akalin): Figure out why implementing (void)cancel:(id)sender
   // to do the above doesn't work.
 }
 
 - (void)windowWillClose:(NSNotification*)notification {
   delegate_->WindowControllerClosed();
   [self autorelease];
 }
 
 @end