Propagate new link-status-change message to any NetworkManagementService
observers.  Also fix the syntax of the "interface-status-change" message.  Add
a null handler in the ThrottleService and Tethering classes (plus fix names).

Change-Id: I58cabc7b0ce5662243bc6513b2de4818065e6c52
diff --git a/services/java/com/android/server/ThrottleService.java b/services/java/com/android/server/ThrottleService.java
index d841cb3..ccfc99b 100644
--- a/services/java/com/android/server/ThrottleService.java
+++ b/services/java/com/android/server/ThrottleService.java
@@ -160,7 +160,7 @@
             mIface = iface;
         }
 
-        public void interfaceLinkStatusChanged(String iface, boolean link) {
+        public void interfaceStatusChanged(String iface, boolean link) {
             if (link) {
                 if (TextUtils.equals(iface, mIface)) {
                     mHandler.obtainMessage(mMsg).sendToTarget();
@@ -176,6 +176,8 @@
             }
         }
 
+        public void interfaceLinkStateChanged(String iface, boolean linkState) {}
+
         public void interfaceRemoved(String iface) {}
     }