Avoid using an empty scopes set when requesting an OAuth2 access token.

google_apis/gaia/account_tracker.cc

Index: google_apis/gaia/account_tracker.cc
diff --git a/google_apis/gaia/account_tracker.cc b/google_apis/gaia/account_tracker.cc
index 0ec2ec1aa9676e6c31a19746cb4a903a93a3452e..50c4e7083fe1cdf4257be8703d80ec99e61df795 100644
--- a/google_apis/gaia/account_tracker.cc
+++ b/google_apis/gaia/account_tracker.cc
@@ -274,8 +274,10 @@ AccountIdFetcher::~AccountIdFetcher() {
 }
 
 void AccountIdFetcher::Start() {
+  OAuth2TokenService::ScopeSet scopes;
+  scopes.insert("https://www.googleapis.com/auth/userinfo.profile");
   login_token_request_ = token_service_->StartRequest(
-      account_key_, OAuth2TokenService::ScopeSet(), this);
+      account_key_, scopes, this);
 }
 
 void AccountIdFetcher::OnGetTokenSuccess(