Separate ProxyResolverMac and ProxyConfigServiceMac into their own files

net/proxy/proxy_resolver_mac.h

Index: net/proxy/proxy_resolver_mac.h
===================================================================
--- net/proxy/proxy_resolver_mac.h	(revision 34241)
+++ net/proxy/proxy_resolver_mac.h	(working copy)
@@ -9,7 +9,6 @@
 
 #include "googleurl/src/gurl.h"
 #include "net/base/net_errors.h"
-#include "net/proxy/proxy_config_service.h"
 #include "net/proxy/proxy_resolver.h"
 
 namespace net {
@@ -42,12 +41,6 @@
   GURL pac_url_;
 };
 
-class ProxyConfigServiceMac : public ProxyConfigService {
- public:
-  // ProxyConfigService methods:
-  virtual int GetProxyConfig(ProxyConfig* config);
-};
-
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_RESOLVER_MAC_H_