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

tools/gn/command_help.cc

 // Copyright (c) 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 <algorithm>
 #include <iostream>
 
 #include "base/command_line.h"
 #include "tools/gn/args.h"
 #include "tools/gn/commands.h"
@@ skipping 87 matching lines @@
     "gn help <anything>\n"
     "  Yo dawg, I heard you like help on your help so I put help on the help\n"
     "  in the help.\n";
 
 int RunHelp(const std::vector<std::string>& args) {
   std::string what;
   if (args.size() == 0) {
     // If no argument is specified, check for switches to allow things like
     // "gn help --args" for help on the args switch.
     const base::CommandLine::SwitchMap& switches =
-        CommandLine::ForCurrentProcess()->GetSwitches();
+        base::CommandLine::ForCurrentProcess()->GetSwitches();
     if (switches.empty()) {
       // Still nothing, show help overview.
       PrintToplevelHelp();
       return 0;
     }
 
     // Switch help needs to be done separately. The CommandLine will strip the
     // switch separators so --args will come out as "args" which is then
     // ambiguous with the variable named "args".
     if (!PrintHelpOnSwitch(switches.begin()->first))
@@ skipping 67 matching lines @@
     return 0;
   }
 
   // No help on this.
   Err(Location(), "No help on \"" + what + "\".").PrintToStdout();
   RunHelp(std::vector<std::string>());
   return 1;
 }
 
 }  // namespace commands