Move MessageLoop to base namespace.

chrome/browser/autocomplete/history_url_provider.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_AUTOCOMPLETE_HISTORY_URL_PROVIDER_H_
 #define CHROME_BROWSER_AUTOCOMPLETE_HISTORY_URL_PROVIDER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/synchronization/cancellation_flag.h"
 #include "chrome/browser/autocomplete/autocomplete_input.h"
 #include "chrome/browser/autocomplete/history_provider.h"
 #include "chrome/browser/autocomplete/history_provider_util.h"
 #include "chrome/browser/autocomplete/url_prefix.h"
 #include "chrome/browser/search_engines/search_terms_data.h"
 #include "chrome/browser/search_engines/template_url.h"
 
+class Profile;
+
+namespace base {
 class MessageLoop;
-class Profile;
+}
 
 namespace history {
 class HistoryBackend;
 class URLDatabase;
 }
 
 // How history autocomplete works
 // ==============================
 //
 // Read down this diagram for temporal ordering.
@@ skipping 54 matching lines @@
 // Used to communicate autocomplete parameters between threads via the history
 // service.
 struct HistoryURLProviderParams {
   HistoryURLProviderParams(const AutocompleteInput& input,
                            bool trim_http,
                            const std::string& languages,
                            TemplateURL* default_search_provider,
                            const SearchTermsData& search_terms_data);
   ~HistoryURLProviderParams();
 
-  MessageLoop* message_loop;
+  base::MessageLoop* message_loop;
 
   // A copy of the autocomplete input. We need the copy since this object will
   // live beyond the original query while it runs on the history thread.
   AutocompleteInput input;
 
   // Should inline autocompletion be disabled? This is initalized from
   // |input.prevent_inline_autocomplete()|, but set to false is the input
   // contains trailing white space.
   bool prevent_inline_autocomplete;
 
@@ skipping 223 matching lines @@
   // It's used to aid the transition to get all URLs from history to
   // be scored in the HistoryQuick provider only.
   bool search_url_database_;
 
   // Only used by unittests; if non-empty, overrides accept-languages in the
   // profile's pref system.
   std::string languages_;
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_HISTORY_URL_PROVIDER_H_