Use a direct include of utf_string_conversions.h in android_webview/, apps/, ash/, base/.

ash/session_state_delegate_stub.cc

 // Copyright (c) 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 "ash/session_state_delegate_stub.h"
 
 #include "ash/shell.h"
 #include "ash/shell/example_factory.h"
 #include "base/string16.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 
 namespace ash {
 
 SessionStateDelegateStub::SessionStateDelegateStub() : screen_locked_(false) {
 }
 
 SessionStateDelegateStub::~SessionStateDelegateStub() {
 }
 
 int SessionStateDelegateStub::GetMaximumNumberOfLoggedInUsers() const {
@@ skipping 50 matching lines @@
 
 void SessionStateDelegateStub::AddSessionStateObserver(
     ash::SessionStateObserver* observer) {
 }
 
 void SessionStateDelegateStub::RemoveSessionStateObserver(
     ash::SessionStateObserver* observer) {
 }
 
 }  // namespace ash