[components] Switch {RefCounted}ProfileKeyedService to use BrowserContext

chrome/browser/chromeos/drive/drive_system_service.cc

Index: chrome/browser/chromeos/drive/drive_system_service.cc
diff --git a/chrome/browser/chromeos/drive/drive_system_service.cc b/chrome/browser/chromeos/drive/drive_system_service.cc
index 1d0f0393b289c19163a6b4a2e35f1a8066f54180..44f3c7cb5b3b3036f9151bcf8efbd8f5fed25961 100644
--- a/chrome/browser/chromeos/drive/drive_system_service.cc
+++ b/chrome/browser/chromeos/drive/drive_system_service.cc
@@ -417,7 +417,9 @@ DriveSystemServiceFactory::~DriveSystemServiceFactory() {
 }
 
 ProfileKeyedService* DriveSystemServiceFactory::BuildServiceInstanceFor(
-    Profile* profile) const {
+    content::BrowserContext* context) const {
+  Profile* profile = static_cast<Profile*>(context);
+
   DriveSystemService* service = NULL;
   if (factory_for_test_.is_null())
     service = new DriveSystemService(profile, NULL, base::FilePath(), NULL);