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

tools/gn/gn_main.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 "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "tools/gn/commands.h"
 #include "tools/gn/err.h"
 #include "tools/gn/location.h"
 #include "tools/gn/standard_out.h"
 #include "tools/gn/switches.h"
 
 // Only the GN-generated build makes this header for now.
 // TODO(brettw) consider adding this if we need it in GYP.
 #if defined(GN_BUILD)
 #include "tools/gn/last_commit_position.h"
 #else
 #define LAST_COMMIT_POSITION "UNKNOWN"
 #endif
 
 namespace {
 
-std::vector<std::string> GetArgs(const CommandLine& cmdline) {
-  CommandLine::StringVector in_args = cmdline.GetArgs();
+std::vector<std::string> GetArgs(const base::CommandLine& cmdline) {
+  base::CommandLine::StringVector in_args = cmdline.GetArgs();
 #if defined(OS_WIN)
   std::vector<std::string> out_args;
   for (const auto& arg : in_args)
     out_args.push_back(base::WideToUTF8(arg));
   return out_args;
 #else
   return in_args;
 #endif
 }
 
 }  // namespace
 
 int main(int argc, char** argv) {
   base::AtExitManager at_exit;
 #if defined(OS_WIN)
-  CommandLine::set_slash_is_not_a_switch();
+  base::CommandLine::set_slash_is_not_a_switch();
 #endif
-  CommandLine::Init(argc, argv);
+  base::CommandLine::Init(argc, argv);
 
-  const CommandLine& cmdline = *CommandLine::ForCurrentProcess();
+  const base::CommandLine& cmdline = *base::CommandLine::ForCurrentProcess();
   std::vector<std::string> args = GetArgs(cmdline);
 
   std::string command;
   if (cmdline.HasSwitch("help") || cmdline.HasSwitch("h")) {
     // Make "-h" and "--help" default to help command.
     command = commands::kHelp;
   } else if (cmdline.HasSwitch(switches::kVersion)) {
     // Make "--version" print the version and exit.
     OutputString(std::string(LAST_COMMIT_POSITION) + "\n");
     exit(0);
@@ skipping 17 matching lines @@
     retval = found_command->second.runner(args);
   } else {
     Err(Location(),
         "Command \"" + command + "\" unknown.").PrintToStdout();
     commands::RunHelp(std::vector<std::string>());
     retval = 1;
   }
 
   exit(retval);  // Don't free memory, it can be really slow!
 }