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

chromeos/process_proxy/process_proxy.cc

Index: chromeos/process_proxy/process_proxy.cc
diff --git a/chromeos/process_proxy/process_proxy.cc b/chromeos/process_proxy/process_proxy.cc
index b1021f4eeefd322e531fc78c273ee3f8e89b718f..913f074cdcfe7129aa57bcc19fa1e710dafcf1ed 100644
--- a/chromeos/process_proxy/process_proxy.cc
+++ b/chromeos/process_proxy/process_proxy.cc
@@ -231,8 +231,8 @@ bool ProcessProxy::LaunchProcess(const std::string& command, int slave_fd,
   options.environ["TERM"] = "xterm";
 
   // Launch the process.
-  return base::LaunchProcess(CommandLine(base::FilePath(command)), options,
-                             pid);
+  return base::LaunchProcess(base::CommandLine(base::FilePath(command)),
+                             options, pid);
 }
 
 void ProcessProxy::CloseAllFdPairs() {