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

chrome/browser/external_extension_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/command_line.h"
 #include "base/string_util.h"
-#include "base/utf_string_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/test/browser_test_utils.h"
 #include "net/test/spawned_test_server/spawned_test_server.h"
 
@@ skipping 119 matching lines @@
 IN_PROC_BROWSER_TEST_F(SearchProviderTest,
                        TestIsSearchProviderInstalledWithException) {
   // Change the url for the test page to one that throws an exception when
   // toString is called on the argument given to isSearchProviderInstalled.
   search_provider_test_url_ = test_server()->GetURL(
       "files/is_search_provider_installed_with_exception.html");
 
   FinishIsSearchProviderInstalledTest(StartIsSearchProviderInstalledTest(
       browser(), "www.google.com", ""));
 }