Cleanup of process-specific DNS.

Backport of MR2 change 421c72b6.

Removes entries sooner.  A bug.
Doesn't add one for phone process at all.  This was intended to be removed long ago.

bug: 2329900
bug: 2377507
diff --git a/services/java/com/android/server/ConnectivityService.java b/services/java/com/android/server/ConnectivityService.java
index 5c0f352..14c70bc 100644
--- a/services/java/com/android/server/ConnectivityService.java
+++ b/services/java/com/android/server/ConnectivityService.java
@@ -661,8 +661,8 @@
             tracker =  mNetTrackers[usedNetworkType];
             if(usedNetworkType != networkType) {
                 Integer currentPid = new Integer(pid);
-                reassessPidDns(pid, true);
                 mNetRequestersPids[usedNetworkType].remove(currentPid);
+                reassessPidDns(pid, true);
                 if (mNetRequestersPids[usedNetworkType].size() != 0) {
                     if (DBG) Log.d(TAG, "not tearing down special network - " +
                            "others still using it");