Move BrowserThread to content namespace.

content/browser/mime_registry_message_filter.cc

 // Copyright (c) 2010 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/browser/mime_registry_message_filter.h"
 
 #include "content/common/mime_registry_messages.h"
 #include "net/base/mime_util.h"
 
+using content::BrowserThread;
+
 MimeRegistryMessageFilter::MimeRegistryMessageFilter() {
 }
 
 MimeRegistryMessageFilter::~MimeRegistryMessageFilter() {
 }
 
 void MimeRegistryMessageFilter::OverrideThreadForMessage(
     const IPC::Message& message,
     BrowserThread::ID* thread) {
   if (IPC_MESSAGE_CLASS(message) == MimeRegistryMsgStart)
@@ skipping 22 matching lines @@
 
 void MimeRegistryMessageFilter::OnGetMimeTypeFromFile(
     const FilePath& file_path, std::string* mime_type) {
   net::GetMimeTypeFromFile(file_path, mime_type);
 }
 
 void MimeRegistryMessageFilter::OnGetPreferredExtensionForMimeType(
     const std::string& mime_type, FilePath::StringType* extension) {
   net::GetPreferredExtensionForMimeType(mime_type, extension);
 }