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

extensions/browser/extension_prefs_factory.cc

Index: extensions/browser/extension_prefs_factory.cc
diff --git a/extensions/browser/extension_prefs_factory.cc b/extensions/browser/extension_prefs_factory.cc
index d67bcc2b6040ee9664a80d6a9f771975c19f8080..c07229cb7da1629da4ff7a7f62b127beb545aff6 100644
--- a/extensions/browser/extension_prefs_factory.cc
+++ b/extensions/browser/extension_prefs_factory.cc
@@ -51,7 +51,8 @@ KeyedService* ExtensionPrefsFactory::BuildServiceInstanceFor(
       context->GetPath().AppendASCII(extensions::kInstallDirectoryName),
       ExtensionPrefValueMapFactory::GetForBrowserContext(context),
       client->CreateAppSorting().Pass(),
-      client->AreExtensionsDisabled(*CommandLine::ForCurrentProcess(), context),
+      client->AreExtensionsDisabled(*base::CommandLine::ForCurrentProcess(),
+                                    context),
       prefs_observers);
 }