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

chrome/browser/ui/views/profiles/avatar_menu_button_browsertest.cc

Index: chrome/browser/ui/views/profiles/avatar_menu_button_browsertest.cc
diff --git a/chrome/browser/ui/views/profiles/avatar_menu_button_browsertest.cc b/chrome/browser/ui/views/profiles/avatar_menu_button_browsertest.cc
index cc2340226267a3c1be214b3a46072527cbbfcc2b..7ad8447d0c34cfbc3ccad62907d805b8fd3b414c 100644
--- a/chrome/browser/ui/views/profiles/avatar_menu_button_browsertest.cc
+++ b/chrome/browser/ui/views/profiles/avatar_menu_button_browsertest.cc
@@ -84,7 +84,8 @@ void AvatarMenuButtonTest::StartAvatarMenu() {
 IN_PROC_BROWSER_TEST_F(AvatarMenuButtonTest, MAYBE_HideOnSecondClick) {
 #if defined(OS_WIN) && defined(USE_ASH)
   // Disable this test in Metro+Ash for now (http://crbug.com/262796).
-  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kAshBrowserTests))
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kAshBrowserTests))
     return;
 #endif