Use a direct include of strings headers in content/browser/, part 2.

content/browser/renderer_host/gtk_key_bindings_handler_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 "content/browser/renderer_host/gtk_key_bindings_handler.h"
 
 #include <gdk/gdkkeysyms.h>
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "content/common/edit_command.h"
 #include "content/public/browser/native_web_keyboard_event.h"
 #include "content/public/common/content_paths.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 
 class GtkKeyBindingsHandlerTest : public testing::Test {
  protected:
   struct EditCommand {
@@ skipping 190 matching lines @@
                  kSelectAll, arraysize(kSelectAll));
 
   static const EditCommand kSetAnchor[] = {
     { "SetMark", "" }
   };
   TestKeyBinding(NewNativeWebKeyboardEvent(GDK_9, GDK_CONTROL_MASK),
                  kSetAnchor, arraysize(kSetAnchor));
 }
 
 }  // namespace content