redesign and reimplement proxy config service and tracker, revise proxy ui on cros

chrome/browser/ui/webui/chromeos/proxy_settings_ui.cc

Index: chrome/browser/ui/webui/chromeos/proxy_settings_ui.cc
===================================================================
--- chrome/browser/ui/webui/chromeos/proxy_settings_ui.cc	(revision 103881)
+++ chrome/browser/ui/webui/chromeos/proxy_settings_ui.cc	(working copy)
@@ -102,10 +102,10 @@
     (static_cast<OptionsPageUIHandler*>(*iter))->Initialize();
   }
   if (proxy_settings()) {
+    proxy_settings()->SetCurrentUserProfile(GetProfile());
     proxy_settings()->MakeActiveNetworkCurrent();
     std::string network = proxy_settings()->GetCurrentNetworkName();
-    if (!network.empty())
-      proxy_handler_->SetNetworkName(network);
+    proxy_handler_->SetNetworkName(network);
   }
 }