Use a direct include of strings headers in chromeos/.

chromeos/ime/component_extension_ime_manager.cc

 // Copyright 2013 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 "base/logging.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "chromeos/ime/component_extension_ime_manager.h"
 
 namespace chromeos {
 namespace {
 const char* kComponentExtensionIMEPrefix = "_comp_ime_";
 }  // namespace
 
 ComponentExtensionEngine::ComponentExtensionEngine() {
 }
 
@@ skipping 169 matching lines @@
         *out_extension = component_extension_imes_[i];
       if (out_engine)
         *out_engine = component_extension_imes_[i].engines[j];
       return true;
     }
   }
   return false;
 }
 
 }  // namespace chromeos