Move PAC DHCP Windows log message back to VLOG()

This generates console spam if you are on a network that does not do WPAD-over-DHCP.

It looks like this was unintentionally upgraded to a LOG(WARNING) in https://codereview.chromium.org/169193002

Review URL: https://codereview.chromium.org/326403011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276917 0039d316-1c4b-4281-b951-d872f2087c98

net/proxy/dhcp_proxy_script_adapter_fetcher_win.cc

@@ -261,7 +261,7 @@ std::string DhcpProxyScriptAdapterFetcher::GetPacURLFromDhcp(
   } while (res == ERROR_MORE_DATA && retry_count <= 3);
 
   if (res != NO_ERROR) {
-    LOG(WARNING) << "Error fetching PAC URL from DHCP: " << res;
+    VLOG(1) << "Error fetching PAC URL from DHCP: " << res;
     UMA_HISTOGRAM_COUNTS("Net.DhcpWpadUnhandledDhcpError", 1);
   } else if (wpad_params.nBytesData) {
     return SanitizeDhcpApiString(