[GCM] Extracting GCMConnectionObserver from GCMAppHandler

components/gcm_driver/gcm_driver_android.cc

Index: components/gcm_driver/gcm_driver_android.cc
diff --git a/components/gcm_driver/gcm_driver_android.cc b/components/gcm_driver/gcm_driver_android.cc
index a6ab94a88f08624dfd6c0d5f38076a7c52521000..d855363b5ad127a904f4b311ec1f559cb23f80b6 100644
--- a/components/gcm_driver/gcm_driver_android.cc
+++ b/components/gcm_driver/gcm_driver_android.cc
@@ -98,6 +98,13 @@ void GCMDriverAndroid::OnSignedIn() {
 void GCMDriverAndroid::Purge() {
 }
 
+void GCMDriverAndroid::AddConnectionObserver(GCMConnectionObserver* observer) {
+}
+
+void GCMDriverAndroid::RemoveConnectionObserver(
+    GCMConnectionObserver* observer) {
+}
+
 void GCMDriverAndroid::Enable() {
 }