Use a direct include of strings headers in chrome/common/, part 1.

chrome/common/chrome_utility_messages.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.
 
 // Multiply-included message file, so no include guard.
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/platform_file.h"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "base/values.h"
 #include "chrome/common/extensions/update_manifest.h"
 #include "chrome/common/safe_browsing/zip_analyzer.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_platform_file.h"
 #include "printing/backend/print_backend.h"
 #include "printing/page_range.h"
 #include "printing/pdf_render_settings.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
@@ skipping 186 matching lines @@
 IPC_MESSAGE_CONTROL0(ChromeUtilityHostMsg_CreateZipFile_Failed)
 #endif  // defined(OS_CHROMEOS)
 
 // Reply when the utility process has started.
 IPC_MESSAGE_CONTROL0(ChromeUtilityHostMsg_ProcessStarted)
 
 // Reply when a zip file has been analyzed for malicious download protection.
 IPC_MESSAGE_CONTROL1(
     ChromeUtilityHostMsg_AnalyzeZipFileForDownloadProtection_Finished,
     safe_browsing::zip_analyzer::Results)