base::Bind: Convert HostResolver::Resolve.

net/base/host_resolver.h

Index: net/base/host_resolver.h
diff --git a/net/base/host_resolver.h b/net/base/host_resolver.h
index b47fa8160fd083fda87c0853ac9e5a93455a4d7e..a5966103d6a24495a18733be4dd5b09fbe501d10 100644
--- a/net/base/host_resolver.h
+++ b/net/base/host_resolver.h
@@ -116,7 +116,7 @@ class NET_EXPORT HostResolver {
   // incompatible IP literal (e.g. IPv6 is disabled and it is an IPv6
   // literal).
   //
-  // If the operation cannnot be completed synchronously, ERR_IO_PENDING will
+  // If the operation cannot be completed synchronously, ERR_IO_PENDING will
   // be returned and the real result code will be passed to the completion
   // callback.  Otherwise the result code is returned immediately from this
   // call.
@@ -128,7 +128,7 @@ class NET_EXPORT HostResolver {
   // Profiling information for the request is saved to |net_log| if non-NULL.
   virtual int Resolve(const RequestInfo& info,
                       AddressList* addresses,
-                      OldCompletionCallback* callback,
+                      const CompletionCallback& callback,
                       RequestHandle* out_req,
                       const BoundNetLog& net_log) = 0;