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

tools/gn/trace.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/trace.h"
 
 #include <algorithm>
 #include <map>
 #include <sstream>
 #include <vector>
@@ skipping 129 matching lines @@
 
 ScopedTrace::~ScopedTrace() {
   Done();
 }
 
 void ScopedTrace::SetToolchain(const Label& label) {
   if (item_)
     item_->set_toolchain(label.GetUserVisibleName(false));
 }
 
-void ScopedTrace::SetCommandLine(const CommandLine& cmdline) {
+void ScopedTrace::SetCommandLine(const base::CommandLine& cmdline) {
   if (item_)
     item_->set_cmdline(FilePathToUTF8(cmdline.GetArgumentsString()));
 }
 
 void ScopedTrace::Done() {
   if (!done_) {
     done_ = true;
     if (trace_log) {
       item_->set_end(base::TimeTicks::HighResNow());
       AddTrace(item_);
@@ skipping 151 matching lines @@
     }
     out << "}";
   }
 
   out << "]}";
 
   std::string out_str = out.str();
   base::WriteFile(file_name, out_str.data(),
                        static_cast<int>(out_str.size()));
 }