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

chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc

Index: chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
diff --git a/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc b/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
index d7f58609596dc140aa3c014f1b11999532ecd694..a8088e314fe172e474895b7e19d59e85ea2cd95c 100644
--- a/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
+++ b/chrome/browser/chromeos/login/users/chrome_user_manager_impl.cc
@@ -764,7 +764,7 @@ void ChromeUserManagerImpl::KioskAppLoggedIn(const std::string& app_id) {
     NOTREACHED();
   }
 
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   command_line->AppendSwitch(::switches::kForceAppMode);
   command_line->AppendSwitchASCII(::switches::kAppId, kiosk_app_id);
 
@@ -787,14 +787,14 @@ void ChromeUserManagerImpl::DemoAccountLoggedIn() {
   WallpaperManager::Get()->SetUserWallpaperNow(DemoAppLauncher::kDemoUserName);
 #endif
 
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   command_line->AppendSwitch(::switches::kForceAppMode);
   command_line->AppendSwitchASCII(::switches::kAppId,
                                   DemoAppLauncher::kDemoAppId);
 
   // Disable window animation since the demo app runs in a single full screen
   // window and window animation causes start-up janks.
-  CommandLine::ForCurrentProcess()->AppendSwitch(
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
       wm::switches::kWindowAnimationsDisabled);
 }