AsyncHostResolver: integrated HostCache, temporarily, until we have RR cache.

net/base/host_resolver_impl.cc

Index: net/base/host_resolver_impl.cc
diff --git a/net/base/host_resolver_impl.cc b/net/base/host_resolver_impl.cc
index 4c367a1d64a75e0cfd426168e02cb388dc47bc00..5b9590e96bdecfdaf15e8188bf4339b3bc8cfd3f 100644
--- a/net/base/host_resolver_impl.cc
+++ b/net/base/host_resolver_impl.cc
@@ -44,18 +44,6 @@ namespace net {
 
 namespace {
 
-// Helper to create an AddressList that has a particular port. It has an
-// optimization to avoid allocating a new address linked list when the
-// port is already what we want.
-AddressList CreateAddressListUsingPort(const AddressList& src, int port) {
-  if (src.GetPort() == port)
-    return src;
-
-  AddressList out = src;
-  out.SetPort(port);
-  return out;
-}
-
 // Helper to mutate the linked list contained by AddressList to the given
 // port. Note that in general this is dangerous since the AddressList's
 // data might be shared (and you should use AddressList::SetPort).