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

content/shell/app/shell_main_delegate_mac.mm

 // Copyright 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 "content/shell/app/shell_main_delegate_mac.h"
 
 #include <unistd.h>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "content/public/common/content_switches.h"
 #include "content/shell/app/paths_mac.h"
 #include "content/shell/common/shell_switches.h"
 
 namespace content {
 
 void EnsureCorrectResolutionSettings() {
   // Exit early if this isn't a browser process.
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kProcessType))
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kProcessType))
     return;
 
   NSString* const kHighResolutionCapable = @"NSHighResolutionCapable";
   base::FilePath info_plist = GetInfoPlistPath();
   base::scoped_nsobject<NSMutableDictionary> info_dict(
       [[NSMutableDictionary alloc]
           initWithContentsOfFile:base::mac::FilePathToNSString(info_plist)]);
 
-  bool running_layout_tests =
-      CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree);
+  bool running_layout_tests = base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kDumpRenderTree);
   bool not_high_resolution_capable =
       [info_dict objectForKey:kHighResolutionCapable] &&
       [[info_dict objectForKey:kHighResolutionCapable] isEqualToNumber:@(NO)];
   if (running_layout_tests == not_high_resolution_capable)
     return;
 
   // We need to update our Info.plist before we can continue.
   [info_dict setObject:@(!running_layout_tests) forKey:kHighResolutionCapable];
   CHECK([info_dict writeToFile:base::mac::FilePathToNSString(info_plist)
                     atomically:YES]);
 
-  const CommandLine::StringVector& original_argv =
-      CommandLine::ForCurrentProcess()->argv();
+  const base::CommandLine::StringVector& original_argv =
+      base::CommandLine::ForCurrentProcess()->argv();
   char** argv = new char*[original_argv.size() + 1];
   for (unsigned i = 0; i < original_argv.size(); ++i)
     argv[i] = const_cast<char*>(original_argv.at(i).c_str());
   argv[original_argv.size()] = NULL;
 
   CHECK(execvp(argv[0], argv));
 }
 
 }  // namespace content