Use a direct include of strings headers in chrome/installer/, part 2.

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"
-#include "base/string16.h"
+#include "base/strings/string16.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace installer {
 
 TEST(UninstallMetricsTest, TestExtractUninstallMetrics) {
   // A make-believe JSON preferences file.
   std::string pref_string(
       "{ \n"
       "  \"foo\": \"bar\",\n"
       "  \"uninstall_metrics\": { \n"
@@ skipping 28 matching lines @@
   ASSERT_TRUE(root.get());
   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