Remove unused HostResolver::Observer.

net/dns/async_host_resolver.cc

Index: net/dns/async_host_resolver.cc
diff --git a/net/dns/async_host_resolver.cc b/net/dns/async_host_resolver.cc
index 70c9277c3975d929108e8d8f5a53056351e6a4e1..ae09917e21b8d8a02b718177ea7161000138b355 100644
--- a/net/dns/async_host_resolver.cc
+++ b/net/dns/async_host_resolver.cc
@@ -287,21 +287,10 @@ void AsyncHostResolver::OnStart(Request* request) {
       NetLog::TYPE_ASYNC_HOST_RESOLVER_REQUEST,
       make_scoped_refptr(new RequestParameters(
           request->info(), request->source_net_log().source())));
-
-  FOR_EACH_OBSERVER(
-      HostResolver::Observer, observers_,
-      OnStartResolution(request->id(), request->info()));
 }
 
 void AsyncHostResolver::OnFinish(Request* request, int result) {
   DCHECK(request);
-  bool was_resolved = result == OK;
-
-  FOR_EACH_OBSERVER(
-      HostResolver::Observer, observers_,
-      OnFinishResolutionWithStatus(
-          request->id(), was_resolved, request->info()));
-
   request->request_net_log().EndEventWithNetErrorCode(
       NetLog::TYPE_ASYNC_HOST_RESOLVER_REQUEST, result);
   request->source_net_log().EndEvent(
@@ -311,10 +300,6 @@ void AsyncHostResolver::OnFinish(Request* request, int result) {
 void AsyncHostResolver::OnCancel(Request* request) {
   DCHECK(request);
 
-  FOR_EACH_OBSERVER(
-      HostResolver::Observer, observers_,
-      OnCancelResolution(request->id(), request->info()));
-
   request->request_net_log().AddEvent(
       NetLog::TYPE_CANCELLED, NULL);
   request->request_net_log().EndEvent(
@@ -334,14 +319,6 @@ void AsyncHostResolver::CancelRequest(RequestHandle req_handle) {
     pending_requests_[request->priority()].remove(request.get());
 }
 
-void AsyncHostResolver::AddObserver(HostResolver::Observer* observer) {
-  observers_.AddObserver(observer);
-}
-
-void AsyncHostResolver::RemoveObserver(HostResolver::Observer* observer) {
-  observers_.RemoveObserver(observer);
-}
-
 void AsyncHostResolver::SetDefaultAddressFamily(
     AddressFamily address_family) {
   NOTIMPLEMENTED();