Removed GCM dependency.

Author: phongcao

android/build.gradle

@@ -23,7 +23,6 @@ android {
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
     implementation 'com.facebook.react:react-native:+'
-    implementation 'com.google.android.gms:play-services-gcm:16.1.0'
     implementation 'com.google.firebase:firebase-messaging:17.6.0'
     implementation 'com.android.support:appcompat-v7:26.1.0'
     implementation 'com.microsoft.azure:notification-hubs-android-sdk:0.4@aar'

android/src/main/java/com/azure/reactnative/notificationhub/ReactNativeNotificationHubModule.java

@@ -14,7 +14,6 @@
 import com.google.android.gms.common.GoogleApiAvailability;
 
 import com.microsoft.windowsazure.messaging.NotificationHub;
-import com.microsoft.windowsazure.notifications.NotificationsManager;
 
 import com.facebook.react.bridge.Promise;
 import com.facebook.react.bridge.ReactApplicationContext;
@@ -106,7 +105,6 @@ public void register(ReadableMap config, Promise promise) {
 
         Intent intent = new Intent(reactContext, ReactNativeRegistrationIntentService.class);
         reactContext.startService(intent);
-        NotificationsManager.handleNotifications(reactContext, senderID, ReactNativeNotificationsHandler.class);
     }
 
     @ReactMethod
@@ -126,7 +124,6 @@ public void unregister(Promise promise) {
         try {
             hub.unregister();
             notificationHubUtil.setRegistrationID(reactContext, null);
-            NotificationsManager.stopHandlingNotifications(reactContext);
         } catch (Exception e) {
             promise.reject(ERROR_NOTIFICATION_HUB, e);
         }