Add support for GCM subtypes to desktop Instance ID implementation

components/gcm_driver/instance_id/instance_id_android.cc

Index: components/gcm_driver/instance_id/instance_id_android.cc
diff --git a/components/gcm_driver/instance_id/instance_id_android.cc b/components/gcm_driver/instance_id/instance_id_android.cc
index fa81705ec058bd1054d400ac22d7d80cf8337bb4..395515f5ea14d3bb6666691a0b54cb2825ef7898 100644
--- a/components/gcm_driver/instance_id/instance_id_android.cc
+++ b/components/gcm_driver/instance_id/instance_id_android.cc
@@ -45,8 +45,9 @@ bool InstanceIDAndroid::RegisterJni(JNIEnv* env) {
 }
 
 // static
-std::unique_ptr<InstanceID> InstanceID::Create(const std::string& app_id,
-                                               gcm::GCMDriver* gcm_driver) {
+std::unique_ptr<InstanceID> InstanceID::CreateInternal(
+    const std::string& app_id,
+    gcm::GCMDriver* gcm_driver) {
   return base::WrapUnique(new InstanceIDAndroid(app_id, gcm_driver));
 }