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

content/common/common_param_traits.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.
 
 // This file is used to define IPC::ParamTraits<> specializations for a number
 // of types so that they can be serialized over IPC.  IPC::ParamTraits<>
 // specializations for basic types (like int and std::string) and types in the
 // 'base' project can be found in ipc/ipc_message_utils.h.  This file contains
 // specializations for types that are used by the content code, and which need
 // manual serialization code.  This is usually because they're not structs with
 // public members..
 
 #ifndef CONTENT_COMMON_COMMON_PARAM_TRAITS_H_
 #define CONTENT_COMMON_COMMON_PARAM_TRAITS_H_
 #pragma once
 
 #include "base/memory/ref_counted.h"
 #include "base/platform_file.h"
 #include "content/common/content_export.h"
 #include "content/common/dom_storage_common.h"
+#include "content/public/common/page_transition_types.h"
 #include "googleurl/src/gurl.h"
 #include "ipc/ipc_message_utils.h"
 #include "net/base/ip_endpoint.h"
 #include "net/url_request/url_request_status.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/surface/transport_dib.h"
 #include "webkit/glue/resource_type.h"
 
 class SkBitmap;
 
@@ skipping 198 matching lines @@
 template <>
 struct SimilarTypeTraits<base::PlatformFileError> {
   typedef int Type;
 };
 
 template <>
 struct SimilarTypeTraits<DOMStorageType> {
   typedef int Type;
 };
 
+template <>
+struct SimilarTypeTraits<content::PageTransition> {
+  typedef int Type;
+};
+
 }  // namespace IPC
 
 #endif  // CONTENT_COMMON_COMMON_PARAM_TRAITS_H_