Update to newest fcm API endpoints

client-libraries/java/rest-client/src/com/google/android/gcm/server/Constants.java

@@ -24,7 +24,7 @@ public final class Constants {
    * Endpoint for sending messages.
    */
   public static final String GCM_SEND_ENDPOINT =
-      "https://gcm-http.googleapis.com/gcm/send";
+      "https://fcm.googleapis.com/fcm/send";
 
   /**
    * Parameter for to field.

samples/android/gcm-demo/src/main/java/com/google/android/gcm/demo/logic/DeviceGroupsHelper.java

@@ -46,7 +46,7 @@
 public class DeviceGroupsHelper {
 
     private static final String GCM_GROUPS_ENDPOINT =
-            "https://gcm-http.googleapis.com/gcm/notification";
+            "https://fcm.googleapis.com/fcm/notification";
 
     private final Context mContext;
     private final LoggingService.Logger mLogger;

samples/android/gcm-demo/src/main/java/com/google/android/gcm/demo/logic/GcmServerSideSender.java

@@ -39,7 +39,7 @@
  */
 public class GcmServerSideSender {
 
-    private static final String GCM_SEND_ENDPOINT = "https://gcm-http.googleapis.com/gcm/send";
+    private static final String GCM_SEND_ENDPOINT = "https://fcm.googleapis.com/fcm/send";
 
     private static final String UTF8 = "UTF-8";