Use base namespace for string16 in chrome/renderer.

chrome/renderer/spellchecker/spellcheck_provider_mac_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 <vector>
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/spellcheck_marker.h"
 #include "chrome/common/spellcheck_messages.h"
 #include "chrome/common/spellcheck_result.h"
 #include "chrome/renderer/spellchecker/spellcheck_provider_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 
 namespace {
 
 class SpellCheckProviderMacTest : public SpellCheckProviderTest {};
 
 struct MessageParameters {
   MessageParameters()
       : router_id(0),
         request_id(0) {}
 
   int router_id;
   int request_id;
-  string16 text;
+  base::string16 text;
   std::vector<SpellCheckMarker> markers;
 };
 
 MessageParameters ReadRequestTextCheck(IPC::Message* message) {
   MessageParameters parameters;
   bool ok = SpellCheckHostMsg_RequestTextCheck::Read(
       message,
       &parameters.router_id,
       &parameters.request_id,
       &parameters.text,
@@ skipping 60 matching lines @@
   EXPECT_EQ(completion2.completion_count_, 0U);
   EXPECT_EQ(provider_.pending_text_request_size(), 1U);
 
   FakeMessageArrival(&provider_, read_parameters2);
   EXPECT_EQ(completion1.completion_count_, 1U);
   EXPECT_EQ(completion2.completion_count_, 1U);
   EXPECT_EQ(provider_.pending_text_request_size(), 0U);
 }
 
 }  // namespace