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

base/android/jni_string_unittest.cc

 // 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.
 
 #include "base/android/jni_string.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/scoped_java_ref.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 namespace android {
 
 TEST(JniString, BasicConversionsUTF8) {
   const std::string kSimpleString = "SimpleTest8";
   JNIEnv* env = AttachCurrentThread();
   std::string result =
       ConvertJavaStringToUTF8(ConvertUTF8ToJavaString(env, kSimpleString));
   EXPECT_EQ(kSimpleString, result);
 }
 
 TEST(JniString, BasicConversionsUTF16) {
   const string16 kSimpleString = UTF8ToUTF16("SimpleTest16");
   JNIEnv* env = AttachCurrentThread();
   string16 result =
       ConvertJavaStringToUTF16(ConvertUTF16ToJavaString(env, kSimpleString));
   EXPECT_EQ(kSimpleString, result);
 }
 
 }  // namespace android
 }  // namespace base