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

win8/metro_driver/chrome_url_launch_handler.cc

Index: win8/metro_driver/chrome_url_launch_handler.cc
diff --git a/win8/metro_driver/chrome_url_launch_handler.cc b/win8/metro_driver/chrome_url_launch_handler.cc
index 7c99b13f91a348815e18d15c7177e80f109e8177..f37706c3735b807c24fe386001f82f2575291cc6 100644
--- a/win8/metro_driver/chrome_url_launch_handler.cc
+++ b/win8/metro_driver/chrome_url_launch_handler.cc
@@ -108,8 +108,9 @@ base::string16 ChromeUrlLaunchHandler::GetUrlFromLaunchArgs(
   }
   base::string16 dummy_command_line(L"dummy.exe ");
   dummy_command_line.append(launch_args);
-  CommandLine command_line = CommandLine::FromString(dummy_command_line);
-  CommandLine::StringVector args = command_line.GetArgs();
+  base::CommandLine command_line =
+      base::CommandLine::FromString(dummy_command_line);
+  base::CommandLine::StringVector args = command_line.GetArgs();
   if (args.size() > 0)
     return args[0];