Convert string16 to base::string16 in content.

content/browser/browser_plugin/test_browser_plugin_guest_delegate.cc

 // Copyright 2013 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/browser_plugin/test_browser_plugin_guest_delegate.h"
 
 namespace content {
 
 TestBrowserPluginGuestDelegate::TestBrowserPluginGuestDelegate()
     : load_aborted_(false) {
 }
 
 TestBrowserPluginGuestDelegate::~TestBrowserPluginGuestDelegate() {
 }
 
 void TestBrowserPluginGuestDelegate::ResetStates() {
   load_aborted_ = false;
   load_aborted_url_ = GURL();
 }
 
 void TestBrowserPluginGuestDelegate::AddMessageToConsole(
     int32 level,
-    const string16& message,
+    const base::string16& message,
     int32 line_no,
-    const string16& source_id) {
+    const base::string16& source_id) {
 }
 
 void TestBrowserPluginGuestDelegate::Close() {
 }
 
 void TestBrowserPluginGuestDelegate::GuestProcessGone(
     base::TerminationStatus status) {
 }
 
 bool TestBrowserPluginGuestDelegate::HandleKeyboardEvent(
@@ skipping 23 matching lines @@
                                                        request_info,
                                                        callback,
                                                        allowed_by_default);
 }
 
 void TestBrowserPluginGuestDelegate::SizeChanged(const gfx::Size& old_size,
                                                  const gfx::Size& new_size) {
 }
 
 }  // namespace content