Push API: Refactor and fix unsubscribe API

components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h

Index: components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h
diff --git a/components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h b/components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h
index 7d31a36e4898a22bbaad64ed52defa2629e6ca2f..a914c89aa005c6ba35a8b115aeb491cd821738bb 100644
--- a/components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h
+++ b/components/gcm_driver/instance_id/fake_gcm_driver_for_instance_id.h
@@ -51,16 +51,19 @@ class FakeGCMDriverForInstanceID : public gcm::FakeGCMDriver,
   const std::string& last_gettoken_app_id() const {
     return last_gettoken_app_id_;
   }
-
   const std::string& last_gettoken_authorized_entity() const {
     return last_gettoken_authorized_entity_;
   }
+  const std::string& last_deletetoken_app_id() const {
+    return last_deletetoken_app_id_;
+  }
 
  private:
   std::map<std::string, std::pair<std::string, std::string>> instance_id_data_;
   std::map<std::string, std::string> tokens_;
   std::string last_gettoken_app_id_;
   std::string last_gettoken_authorized_entity_;
+  std::string last_deletetoken_app_id_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeGCMDriverForInstanceID);
 };