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

tools/gn/command_refs.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 <map>
 #include <set>
 
 #include "base/command_line.h"
 #include "tools/gn/commands.h"
 #include "tools/gn/deps_iterator.h"
@@ skipping 269 matching lines @@
     "      containing the given file as a source.\n";
 
 int RunRefs(const std::vector<std::string>& args) {
   if (args.size() != 2) {
     Err(Location(), "You're holding it wrong.",
         "Usage: \"gn refs <build_dir> (<label_pattern>|<file>)\"")
         .PrintToStdout();
     return 1;
   }
 
-  const CommandLine* cmdline = CommandLine::ForCurrentProcess();
+  const base::CommandLine* cmdline = base::CommandLine::ForCurrentProcess();
   bool tree = cmdline->HasSwitch("tree");
   bool all = cmdline->HasSwitch("all");
   bool all_toolchains = cmdline->HasSwitch("all-toolchains");
   bool files = cmdline->HasSwitch("files");
 
   Setup* setup = new Setup;
   setup->set_check_for_bad_items(false);
   if (!setup->DoSetup(args[0], false) || !setup->Run())
     return 1;
 
@@ skipping 77 matching lines @@
           results.insert(cur_dep->second);
       }
     }
     OutputResultSet(results, files);
   }
 
   return 0;
 }
 
 }  // namespace commands