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

tools/gn/ninja_build_writer.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 "tools/gn/ninja_build_writer.h"
 
 #include <fstream>
 #include <map>
 
 #include "base/command_line.h"
@@ skipping 17 matching lines @@
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 namespace {
 
 std::string GetSelfInvocationCommand(const BuildSettings* build_settings) {
   base::FilePath executable;
   PathService::Get(base::FILE_EXE, &executable);
 
-  CommandLine cmdline(executable.NormalizePathSeparatorsTo('/'));
+  base::CommandLine cmdline(executable.NormalizePathSeparatorsTo('/'));
   cmdline.AppendArg("gen");
   cmdline.AppendArg(build_settings->build_dir().value());
   cmdline.AppendSwitchPath(std::string("--") + switches::kRoot,
                            build_settings->root_path());
   // Successful automatic invocations shouldn't print output.
   cmdline.AppendSwitch(std::string("-") + switches::kQuiet);
 
   EscapeOptions escape_shell;
   escape_shell.mode = ESCAPE_NINJA_COMMAND;
 #if defined(OS_WIN)
   // The command line code quoting varies by platform. We have one string,
   // possibly with spaces, that we want to quote. The Windows command line
   // quotes again, so we don't want quoting. The Posix one doesn't.
   escape_shell.inhibit_quoting = true;
 #endif
 
-  const CommandLine& our_cmdline = *CommandLine::ForCurrentProcess();
-  const CommandLine::SwitchMap& switches = our_cmdline.GetSwitches();
-  for (CommandLine::SwitchMap::const_iterator i = switches.begin();
+  const base::CommandLine& our_cmdline =
+      *base::CommandLine::ForCurrentProcess();
+  const base::CommandLine::SwitchMap& switches = our_cmdline.GetSwitches();
+  for (base::CommandLine::SwitchMap::const_iterator i = switches.begin();
        i != switches.end(); ++i) {
     // Only write arguments we haven't already written. Always skip "args"
     // since those will have been written to the file and will be used
     // implicitly in the future. Keeping --args would mean changes to the file
     // would be ignored.
     if (i->first != switches::kQuiet &&
         i->first != switches::kRoot &&
         i->first != switches::kArgs) {
       std::string escaped_value =
           EscapeString(FilePathToUTF8(i->second), escape_shell, NULL);
@@ skipping 220 matching lines @@
   EscapeOptions ninja_escape;
   ninja_escape.mode = ESCAPE_NINJA;
 
   // Escape for special chars Ninja will handle.
   std::string escaped = EscapeString(phony_name, ninja_escape, NULL);
 
   out_ << "build " << escaped << ": phony ";
   path_output_.WriteFile(out_, target_file);
   out_ << std::endl;
 }