Add new text for indicating we are resolving hosts during proxy resolution.

net/proxy/mock_proxy_resolver.cc

Index: net/proxy/mock_proxy_resolver.cc
diff --git a/net/proxy/mock_proxy_resolver.cc b/net/proxy/mock_proxy_resolver.cc
index c73daadba147339877e350e71bd662b00450d300..597a06cf3abc00d6395559c768237849bce73be2 100644
--- a/net/proxy/mock_proxy_resolver.cc
+++ b/net/proxy/mock_proxy_resolver.cc
@@ -77,6 +77,18 @@ void MockAsyncProxyResolverBase::CancelRequest(RequestHandle request_handle) {
   RemovePendingRequest(request);
 }
 
+LoadState MockAsyncProxyResolverBase::GetLoadState(
+    RequestHandle request_handle) const {
+  NOTREACHED();
+  return LOAD_STATE_IDLE;
+}
+
+LoadState MockAsyncProxyResolverBase::GetLoadStateThreadSafe(
+    RequestHandle request_handle) const {
+  NOTREACHED();
+  return LOAD_STATE_IDLE;
+}
+
 int MockAsyncProxyResolverBase::SetPacScript(
     const scoped_refptr<ProxyResolverScriptData>& script_data,
     OldCompletionCallback* callback) {