Start splitting out WebUI into an implementation class and an interface that each page implements...

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

Index: chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc
===================================================================
--- chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc	(revision 117388)
+++ chrome/browser/ui/webui/chromeos/mobile_setup_ui.cc	(working copy)
@@ -1386,11 +1386,10 @@
 //
 ////////////////////////////////////////////////////////////////////////////////
 
-MobileSetupUI::MobileSetupUI(WebContents* contents) : WebUI(contents) {
+MobileSetupUI::MobileSetupUI(WebContents* contents) : WebUI(contents, this) {
   chromeos::CellularNetwork* network = GetCellularNetwork();
   std::string service_path = network ? network->service_path() : std::string();
-  MobileSetupHandler* handler = new MobileSetupHandler(service_path);
-  AddMessageHandler(handler);
+  AddMessageHandler(new MobileSetupHandler(service_path));
   MobileSetupUIHTMLSource* html_source =
       new MobileSetupUIHTMLSource(service_path);
 
@@ -1400,7 +1399,6 @@
 }
 
 void MobileSetupUI::RenderViewCreated(RenderViewHost* host) {
-  WebUI::RenderViewCreated(host);
   // Destroyed by the corresponding RenderViewHost.
   new PortalFrameLoadObserver(host, web_contents()->GetWebUI());
 }