base: Get rid of 'using' declaration of StringAppendF.

chrome/test/startup/shutdown_test.cc

 // Copyright (c) 2010 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/environment.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/platform_thread.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
@@ skipping 89 matching lines @@
         // creating databases doesn't impact all the runs.
         clear_profile_ = false;
         // Clear template_user_data_ so we don't try to copy it over each time
         // through.
         set_template_user_data(FilePath());
       }
     }
 
     std::string times;
     for (int i = 0; i < numCycles; ++i)
-      StringAppendF(&times, "%.2f,", timings[i].InMillisecondsF());
+      base::StringAppendF(&times, "%.2f,", timings[i].InMillisecondsF());
     PrintResultList(graph, "", trace, times, "ms", important);
   }
 };
 
 TEST_F(ShutdownTest, SimpleWindowClose) {
   RunShutdownTest("shutdown", "simple-window-close",
                   true, /* important */ SIMPLE, UITest::WINDOW_CLOSE);
 }
 
 TEST_F(ShutdownTest, SimpleUserQuit) {
@@ skipping 22 matching lines @@
 #else
 #define MAYBE_TwentyTabsSessionEnding TwentyTabsSessionEnding
 #endif
 
 TEST_F(ShutdownTest, MAYBE_TwentyTabsSessionEnding) {
   RunShutdownTest("shutdown", "twentytabs-session-ending",
                   true, /* important */ TWENTY_TABS, UITest::SESSION_ENDING);
 }
 
 }  // namespace