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

chrome/browser/profiles/profile.cc

Index: chrome/browser/profiles/profile.cc
diff --git a/chrome/browser/profiles/profile.cc b/chrome/browser/profiles/profile.cc
index 414aae3b9c13e2787bb1c91bd89fb2f75e6d2594..6700d55cbc05a3323c3e8e7a49133811ebea6fe3 100644
--- a/chrome/browser/profiles/profile.cc
+++ b/chrome/browser/profiles/profile.cc
@@ -205,8 +205,9 @@ std::string Profile::GetDebugName() {
 
 bool Profile::IsGuestSession() const {
 #if defined(OS_CHROMEOS)
-  static bool is_guest_session = CommandLine::ForCurrentProcess()->HasSwitch(
-      chromeos::switches::kGuestSession);
+  static bool is_guest_session =
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          chromeos::switches::kGuestSession);
   return is_guest_session;
 #else
   return GetPath() == ProfileManager::GetGuestProfilePath();