Add base:: to string16s in chrome/.

chrome/installer/util/uninstall_metrics_unittest.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 "chrome/installer/util/uninstall_metrics.h"
 
 #include <string>
 
 #include "base/json/json_string_value_serializer.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 18 matching lines @@
       "  \"blah\": {\n"
       "    \"this_sentence_is_true\": false\n"
       "  },\n"
       "  \"user_experience_metrics\": { \n"
       "    \"client_id_timestamp\": \"1234567890\","
       "    \"reporting_enabled\": true\n"
       "  }\n"
       "} \n");
 
   // The URL string we expect to be generated from said make-believe file.
-  string16 expected_url_string(
+  base::string16 expected_url_string(
       L"&installation_date2=1235341141"
       L"&last_launch_time_sec=1235341118"
       L"&last_observed_running_time_sec=1235341183"
       L"&launch_count=11&page_load_count=68"
       L"&uptime_sec=809");
 
   JSONStringValueSerializer json_deserializer(pref_string);
   std::string error_message;
 
   scoped_ptr<Value> root(json_deserializer.Deserialize(NULL, &error_message));
   ASSERT_TRUE(root.get());
-  string16 uninstall_metrics_string;
+  base::string16 uninstall_metrics_string;
 
   EXPECT_TRUE(
       ExtractUninstallMetrics(*static_cast<DictionaryValue*>(root.get()),
                               &uninstall_metrics_string));
   EXPECT_EQ(expected_url_string, uninstall_metrics_string);
 }
 
 }  // namespace installer