Use a direct include of strings headers in chrome/browser/ui/a*/.

chrome/browser/ui/app_list/search/history_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 "base/basictypes.h"
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/run_loop.h"
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/threading/platform_thread.h"
 #include "base/timer.h"
 #include "chrome/browser/ui/app_list/search/history.h"
 #include "chrome/browser/ui/app_list/search/history_data.h"
 #include "chrome/browser/ui/app_list/search/history_data_observer.h"
 #include "chrome/browser/ui/app_list/search/history_data_store.h"
 #include "chrome/test/base/testing_profile.h"
 #include "content/public/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 289 matching lines @@
 
   // The oldest secondary is gone.
   EXPECT_EQ(UNKNOWN_RESULT, GetResultType("1"));
 
   // Touched oldest survived.
   EXPECT_EQ(PERFECT_SECONDARY, GetResultType("0"));
 }
 
 }  // namespace test
 }  // namespace app_list