Extract the parsing of proxy rules to ProxyConfig::ProxyRules, and unit-test....

net/proxy/proxy_service.h

Index: net/proxy/proxy_service.h
===================================================================
--- net/proxy/proxy_service.h	(revision 12729)
+++ net/proxy/proxy_service.h	(working copy)
@@ -141,6 +141,11 @@
   // (ProxyResolver runs on PAC thread.)
   int TryToCompleteSynchronously(const GURL& url, ProxyInfo* result);
 
+  // Set |result| with the proxy to use for |url|, based on |rules|.
+  void ApplyProxyRules(const GURL& url,
+                       const ProxyConfig::ProxyRules& rules,
+                       ProxyInfo* result);
+
   // Starts the PAC thread if it isn't already running.
   void InitPacThread();