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

chrome/browser/chromeos/login/signin/oauth2_login_manager.cc

Index: chrome/browser/chromeos/login/signin/oauth2_login_manager.cc
diff --git a/chrome/browser/chromeos/login/signin/oauth2_login_manager.cc b/chrome/browser/chromeos/login/signin/oauth2_login_manager.cc
index 8128ddaccaa69f27b64974cc987cc538dcd51ee3..15bda188f4ba569154996099928c29d8d67aa4c5 100644
--- a/chrome/browser/chromeos/login/signin/oauth2_login_manager.cc
+++ b/chrome/browser/chromeos/login/signin/oauth2_login_manager.cc
@@ -47,8 +47,8 @@ OAuth2LoginManager::OAuth2LoginManager(Profile* user_profile)
 
   // For telemetry, we mark session restore completed to avoid warnings from
   // MergeSessionThrottle.
-  if (CommandLine::ForCurrentProcess()->
-          HasSwitch(chromeos::switches::kDisableGaiaServices)) {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          chromeos::switches::kDisableGaiaServices)) {
     SetSessionRestoreState(SESSION_RESTORE_DONE);
   }
 }