Use a direct include of utf_string_conversions.h in chrome/browser/, part 2.

chrome/browser/extensions/extension_warning_set.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 "chrome/browser/extensions/extension_warning_set.h"
 
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_set.h"
 #include "content/public/browser/browser_thread.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "net/base/escape.h"
 #include "ui/base/l10n/l10n_util.h"
 
 using content::BrowserThread;
@@ skipping 179 matching lines @@
   }
 }
 
 bool operator<(const ExtensionWarning& a, const ExtensionWarning& b) {
   if (a.extension_id() != b.extension_id())
     return a.extension_id() < b.extension_id();
   return a.warning_type() < b.warning_type();
 }
 
 }  // namespace extensions