Convert ProtocolHandlerRegistry to be a ProfileKeyedService.

chrome/browser/profiles/profile_io_data.h

Index: chrome/browser/profiles/profile_io_data.h
diff --git a/chrome/browser/profiles/profile_io_data.h b/chrome/browser/profiles/profile_io_data.h
index 64631c58a37fe4bf688a0bb8f5e078a786b8dbd6..795fcaafe2b8af5e6252bd81dfbdc89df3443967 100644
--- a/chrome/browser/profiles/profile_io_data.h
+++ b/chrome/browser/profiles/profile_io_data.h
@@ -19,6 +19,7 @@
 #include "chrome/browser/prefs/pref_member.h"
 #include "content/public/browser/resource_context.h"
 #include "net/cookies/cookie_monster.h"
+#include "net/url_request/url_request_job_factory.h"
 
 class CookieSettings;
 class DesktopNotificationService;
@@ -158,7 +159,13 @@ class ProfileIOData {
     DesktopNotificationService* notification_service;
 #endif
 
-    scoped_refptr<ProtocolHandlerRegistry> protocol_handler_registry;
+    // This pointer exists only as a means of conveying a url interceptor
+    // pointer from the protocol handler registry on the UI thread to the
+    // the URLRequestJobFactory on the IO thread. The consumer MUST take
+    // ownership of the object by calling release() on this pointer.
+    scoped_ptr<net::URLRequestJobFactory::Interceptor>
+        protocol_handler_url_interceptor;
+
     // We need to initialize the ProxyConfigService from the UI thread
     // because on linux it relies on initializing things through gconf,
     // and needs to be on the main thread.