base::Bind: Convert HostResolver::Resolve.

chrome/browser/net/network_stats.h

Index: chrome/browser/net/network_stats.h
diff --git a/chrome/browser/net/network_stats.h b/chrome/browser/net/network_stats.h
index 65742b60ecf690858250279210d3d7c773995195..8fcee6dff9a1628dff9fa322c7f13dc50f6df86e 100644
--- a/chrome/browser/net/network_stats.h
+++ b/chrome/browser/net/network_stats.h
@@ -176,9 +176,6 @@ class NetworkStats {
   // HostResolver fills out the |addresses_| after host resolution is completed.
   net::AddressList addresses_;
 
-  // Callback to call when host resolution is completed.
-  net::OldCompletionCallbackImpl<NetworkStats> resolve_callback_;
-
   // Callback to call when data is read from the server.
   net::OldCompletionCallbackImpl<NetworkStats> read_callback_;