Generalize the net module's LoadLog facility from a passive container, to an event stream (NetLog).

net/proxy/proxy_resolver_winhttp.cc

Index: net/proxy/proxy_resolver_winhttp.cc
===================================================================
--- net/proxy/proxy_resolver_winhttp.cc	(revision 41560)
+++ net/proxy/proxy_resolver_winhttp.cc	(working copy)
@@ -56,7 +56,7 @@
                                          ProxyInfo* results,
                                          CompletionCallback* /*callback*/,
                                          RequestHandle* /*request*/,
-                                         LoadLog* /*load_log*/) {
+                                         const BoundNetLog& /*net_log*/) {
   // If we don't have a WinHTTP session, then create a new one.
   if (!session_handle_ && !OpenWinHttpSession())
     return ERR_FAILED;