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

content/browser/renderer_host/resource_dispatcher_host.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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "content/browser/renderer_host/resource_dispatcher_host.h"
 
 #include <set>
 #include <vector>
@@ skipping 736 matching lines @@
     const content::ResourceContext& context) {
   return new ResourceDispatcherHostRequestInfo(handler,
                                                ChildProcessInfo::RENDER_PROCESS,
                                                child_id,
                                                route_id,
                                                0,
                                                request_id_,
                                                false,     // is_main_frame
                                                -1,        // frame_id
                                                ResourceType::SUB_RESOURCE,
-                                               PageTransition::LINK,
+                                               content::PAGE_TRANSITION_LINK,
                                                0,         // upload_size
                                                download,  // is_download
                                                download,  // allow_download
                                                false,     // has_user_gesture
                                                &context);
 }
 
 void ResourceDispatcherHost::OnSwapOutACK(
     const ViewMsg_SwapOut_Params& params) {
   // Closes for cross-site transitions are handled such that the cross-site
@@ skipping 1381 matching lines @@
   return HTTP_AUTH_RESOURCE_BLOCKED_CROSS;
 }
 
 bool ResourceDispatcherHost::allow_cross_origin_auth_prompt() {
   return allow_cross_origin_auth_prompt_;
 }
 
 void ResourceDispatcherHost::set_allow_cross_origin_auth_prompt(bool value) {
   allow_cross_origin_auth_prompt_ = value;
 }