Revert "[ST02.1] Add TYPE_CNAME constant to DnsResolver"

Revert submission 1387135-st02

Reason for revert: Usage of TYPE_CNAME in a library shared among
modules does not interact well with current module release process

Reverted Changes:
Ib5616c65c:[ST02.2] Use the getters of DnsHeader
I5e58f99b0:[ST02.1] Add TYPE_CNAME constant to DnsResolver
I0c1547cbc:[ST02] Add methods for synthesizing DNS packets

Change-Id: I5aa9f28f1268f966f62041193ceb7c8bef994579
diff --git a/framework/src/android/net/DnsResolver.java b/framework/src/android/net/DnsResolver.java
index 382a9de..5e637f9 100644
--- a/framework/src/android/net/DnsResolver.java
+++ b/framework/src/android/net/DnsResolver.java
@@ -71,14 +71,12 @@
 
     @IntDef(prefix = { "TYPE_" },  value = {
             TYPE_A,
-            TYPE_AAAA,
-            TYPE_CNAME
+            TYPE_AAAA
     })
     @Retention(RetentionPolicy.SOURCE)
     @interface QueryType {}
     public static final int TYPE_A = 1;
     public static final int TYPE_AAAA = 28;
-    public static final int TYPE_CNAME = 5;
 
     @IntDef(prefix = { "FLAG_" }, value = {
             FLAG_EMPTY,