Upstream PO2TS_IOS unit test.

components/signin/ios/browser/profile_oauth2_token_service_ios.h

Index: components/signin/ios/browser/profile_oauth2_token_service_ios.h
diff --git a/components/signin/ios/browser/profile_oauth2_token_service_ios.h b/components/signin/ios/browser/profile_oauth2_token_service_ios.h
index 2f32d1ce7ac14183a9160314f630a8475f02faf3..0e254bae90dd2931098821fa059cee87ebde71cf 100644
--- a/components/signin/ios/browser/profile_oauth2_token_service_ios.h
+++ b/components/signin/ios/browser/profile_oauth2_token_service_ios.h
@@ -16,14 +16,17 @@ namespace ios{
 class ProfileOAuth2TokenServiceIOSProvider;
 }
 
-// A specialization of ProfileOAuth2TokenService for OS_IOS. It fetches access
-// tokens from the SSOAuth library if the user is signed in using shared
-// authentication or defaults to the parent class
-// |MutableProfileOAuth2TokenService| for pre-SSO signed in users.
+// A specialization of ProfileOAuth2TokenService that will be returned by
+// ProfileOAuth2TokenServiceFactory for OS_IOS when iOS authentication service
+// is used to lookup OAuth2 tokens.
 //
 // See |ProfileOAuth2TokenService| for usage details.
+//
+// Note: Requests should be started from the UI thread. To start a
+// request from aother thread, please use ProfileOAuth2TokenServiceRequest.
 class ProfileOAuth2TokenServiceIOS : public MutableProfileOAuth2TokenService {
  public:
+  ProfileOAuth2TokenServiceIOS();
   virtual ~ProfileOAuth2TokenServiceIOS();
 
   // KeyedService
@@ -84,10 +87,6 @@ class ProfileOAuth2TokenServiceIOS : public MutableProfileOAuth2TokenService {
   void ForceInvalidGrantResponses();
 
  protected:
-  friend class ProfileOAuth2TokenServiceFactory;
-
-  ProfileOAuth2TokenServiceIOS();
-
   virtual OAuth2AccessTokenFetcher* CreateAccessTokenFetcher(
       const std::string& account_id,
       net::URLRequestContextGetter* getter,