Use a direct include of strings headers in content/browser/, part 1.

content/browser/bookmarklet_browsertest.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/string_util.h"
+#include "base/strings/string_util.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/test/browser_test_utils.h"
 #include "content/public/test/test_utils.h"
 #include "content/shell/shell.h"
 #include "content/test/content_browser_test.h"
 #include "content/test/content_browser_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace content {
 
@@ skipping 50 matching lines @@
   shell()->LoadURL(GURL(
       "javascript:document.open();"
       "document.write('hello world');"
       "document.close();"));
   EXPECT_EQ("hello world", GetBodyText());
 }
 
 
 }  // namespace content