Make callers of CommandLine use it via the base:: namespace.

ui/aura/demo/demo_main.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 "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/i18n/icu_util.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "third_party/skia/include/core/SkXfermode.h"
@@ skipping 152 matching lines @@
 
   host->Show();
   base::MessageLoopForUI::current()->Run();
 
   return 0;
 }
 
 }  // namespace
 
 int main(int argc, char** argv) {
-  CommandLine::Init(argc, argv);
+  base::CommandLine::Init(argc, argv);
 
   // The exit manager is in charge of calling the dtors of singleton objects.
   base::AtExitManager exit_manager;
 
   base::i18n::InitializeICU();
 
   return DemoMain();
 }