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

chrome_frame/test/perf/chrome_frame_perftest.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 "chrome_frame/test/perf/chrome_frame_perftest.h"
 
 #include <atlwin.h>
 #include <atlhost.h>
 #include <map>
 #include <vector>
 #include <string>
@@ skipping 330 matching lines @@
 
       CoFreeUnusedLibraries();
 
       // TODO(beng): Can't shut down so quickly. Figure out why, and fix. If we
       // do, we crash.
       PlatformThread::Sleep(50);
     }
 
     std::string times;
     for (int i = 0; i < kNumCycles; ++i)
-      StringAppendF(&times, "%.2f,", timings[i].InMillisecondsF());
+      base::StringAppendF(&times, "%.2f,", timings[i].InMillisecondsF());
 
     PrintResultList(graph, "", trace, times, "ms", important);
   }
 
   FilePath dir_app_;
   FilePath chrome_dll_;
   FilePath chrome_exe_;
   FilePath chrome_frame_dll_;
   FilePath icu_dll_;
   FilePath gears_dll_;
@@ skipping 1013 matching lines @@
 }
 
 template <class Monitor>
 void PrintPerfTestResults(const Monitor* monitor,
                           int num_cycles,
                           const char* result_name) {
   std::string times;
 
   for (int i = 0; i < num_cycles; ++i) {
     ASSERT_TRUE(monitor[i].is_valid());
-    StringAppendF(&times, "%.2f,",
-                  monitor[i].duration().InMillisecondsF());
+    base::StringAppendF(&times,
+                        "%.2f,",
+                        monitor[i].duration().InMillisecondsF());
   }
 
   PrintResultList(result_name, "", "t", times, "ms", false);
 }
 
 TEST(TestAsPerfTest, MetaTag_createproxy) {
   const int kNumCycles = 10;
 
   MonitorTracePair create_proxy_monitor[kNumCycles];
   MonitorTraceBetweenEventPair browser_main_start_monitor[kNumCycles];
@@ skipping 59 matching lines @@
   PrintPerfTestResults(automation_provider_connect_monitor, kNumCycles,
                        "automationproviderconnect");
   PrintPerfTestResults(external_tab_navigate_monitor, kNumCycles,
                        "externaltabnavigate");
   PrintPerfTestResults(renderer_main_monitor, kNumCycles,
                        "beginrenderermain");
 #ifdef NDEBUG
   PrintPerfTestResults(pre_read_chrome_monitor, kNumCycles, "PreReadImage");
 #endif  // NDEBUG
 }