[Cleanup] Remove StringPrintf from global namespace

chrome/browser/ui/ash/launcher/chrome_launcher_controller_browsertest.cc

 // Copyright (c) 2012 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/browser/ui/ash/launcher/chrome_launcher_controller.h"
 
 #include "ash/ash_switches.h"
 #include "ash/launcher/launcher.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/shell.h"
@@ skipping 792 matching lines @@
   // Make sure to have a browser window
   chrome::NewTab(browser());
 
   // No overflow yet.
   EXPECT_FALSE(launcher_->IsShowingOverflowBubble());
 
   ash::test::LauncherViewTestAPI test(launcher_->GetLauncherViewForTest());
 
   int items_added = 0;
   while (!test.IsOverflowButtonVisible()) {
-    std::string fake_app_id = StringPrintf("fake_app_%d", items_added);
+    std::string fake_app_id = base::StringPrintf("fake_app_%d", items_added);
     PinFakeApp(fake_app_id);
 
     ++items_added;
     ASSERT_LT(items_added, 10000);
   }
 
   // Now show overflow bubble.
   test.ShowOverflowBubble();
   EXPECT_TRUE(launcher_->IsShowingOverflowBubble());
 
   // Unpin first pinned app and there should be no crash.
   ChromeLauncherController* controller =
       static_cast<ChromeLauncherController*>(launcher_->delegate());
   controller->UnpinAppsWithID(std::string("fake_app_0"));
 }