Don't resolve IP literals.

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 aa1ed9cce981d5e1122019ff33078eef9ce2fa06..11d93067b904bef5a2cfc3f18b6d3f35cd672346 100644
--- a/net/base/host_resolver_impl.cc
+++ b/net/base/host_resolver_impl.cc
@@ -754,8 +754,6 @@ HostResolverImpl::~HostResolverImpl() {
     delete job_pools_[i];
 }
 
-// TODO(eroman): Don't create cache entries for hostnames which are simply IP
-// address literals.
 int HostResolverImpl::Resolve(const RequestInfo& info,
                               AddressList* addresses,
                               CompletionCallback* callback,
@@ -772,6 +770,23 @@ int HostResolverImpl::Resolve(const RequestInfo& info,
   // Update the net log and notify registered observers.
   OnStartRequest(net_log, request_id, info);
 
+  // Check for IP literal.
+  IPAddressNumber ip_number;
+  if (ParseIPLiteralToNumber(info.hostname(), &ip_number)) {
+    DCHECK_EQ((info.host_resolver_flags() &
+               ~(HOST_RESOLVER_CANONNAME | HOST_RESOLVER_LOOPBACK_ONLY)), 0)
+        << " Unhandled flag";
+    AddressList result(ip_number, info.port(),
+                       (info.host_resolver_flags() & HOST_RESOLVER_CANONNAME));
+
+    *addresses = result;
+    // Update the net log and notify registered observers.
+    OnFinishRequest(net_log, request_id, info, OK,
+                    0,  /* os_error (unknown since from cache) */
+                    false  /* was_from_cache */);
+    return OK;
+  }
+
   // Build a key that identifies the request in the cache and in the
   // outstanding jobs map.
   Key key = GetEffectiveKeyForRequest(info);