Reduce the amount of included header files. Vast change like in "Oh God! This...

chrome/browser/external_protocol_handler.cc

 // Copyright (c) 2006-2008 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 "chrome/browser/external_protocol_handler.h"
 
 #include <windows.h>
 #include <shellapi.h>
 #include <set>
 
 #include "base/logging.h"
 #include "base/message_loop.h"
 #include "base/registry.h"
 #include "base/scoped_ptr.h"
+#include "base/string_util.h"
 #include "base/thread.h"
 #include "chrome/browser/browser.h"
 #include "chrome/browser/browser_process_impl.h"
 #include "chrome/browser/views/external_protocol_dialog.h"
 #include "chrome/common/pref_service.h"
 #include "chrome/common/pref_names.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/escape.h"
 
 // static
@@ skipping 162 matching lines @@
     // bug 1136923.
     return;
   }
 }
 
 // static
 void ExternalProtocolHandler::RegisterPrefs(PrefService* prefs) {
   prefs->RegisterDictionaryPref(prefs::kExcludedSchemes);
 }