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

chrome/browser/extensions/background_app_browsertest.cc

Index: chrome/browser/extensions/background_app_browsertest.cc
diff --git a/chrome/browser/extensions/background_app_browsertest.cc b/chrome/browser/extensions/background_app_browsertest.cc
index 260ef4354af8a5deef592259d70e83d343f2f706..020953d3b25ae3599368c2bd60309d0f9d09199c 100644
--- a/chrome/browser/extensions/background_app_browsertest.cc
+++ b/chrome/browser/extensions/background_app_browsertest.cc
@@ -9,7 +9,7 @@
 
 class TestBackgroundModeManager : public BackgroundModeManager {
  public:
-  TestBackgroundModeManager(CommandLine* command_line,
+  TestBackgroundModeManager(base::CommandLine* command_line,
                             ProfileInfoCache* profile_cache)
       : BackgroundModeManager(command_line, profile_cache),
         showed_background_app_installed_notification_for_test_(false) {}
@@ -50,7 +50,7 @@ IN_PROC_BROWSER_TEST_F(BackgroundAppBrowserTest, ReloadBackgroundApp) {
   // Pass this in to the browser test.
   scoped_ptr<BackgroundModeManager> test_background_mode_manager(
       new TestBackgroundModeManager(
-          CommandLine::ForCurrentProcess(),
+          base::CommandLine::ForCurrentProcess(),
           &(g_browser_process->profile_manager()->GetProfileInfoCache())));
   g_browser_process->set_background_mode_manager_for_test(
       test_background_mode_manager.Pass());