Update the http proxy on LinkProperty change.

bug:16308315
Change-Id: Ie44634a9223f289903c09653f77a998d3a344654
diff --git a/services/core/java/com/android/server/ConnectivityService.java b/services/core/java/com/android/server/ConnectivityService.java
index 7655e92..ad8f446 100644
--- a/services/core/java/com/android/server/ConnectivityService.java
+++ b/services/core/java/com/android/server/ConnectivityService.java
@@ -4196,6 +4196,7 @@
         final boolean flushDns = updateRoutes(newLp, oldLp, netId);
         updateDnses(newLp, oldLp, netId, flushDns);
         updateClat(newLp, oldLp, networkAgent);
+        if (isDefaultNetwork(networkAgent)) handleApplyDefaultProxy(newLp.getHttpProxy());
     }
 
     private void updateClat(LinkProperties newLp, LinkProperties oldLp, NetworkAgentInfo na) {