Componentize component_updater: Split content::ResourceThrottle from CUS.

chrome/browser/component_updater/crx_update_item.h

Index: chrome/browser/component_updater/crx_update_item.h
diff --git a/chrome/browser/component_updater/crx_update_item.h b/chrome/browser/component_updater/crx_update_item.h
index cb7ac62246afd0b76c7883236acea41cdc72dbb4..5b0756cfbca1dc0c0ca6f2064df76648abe671cb 100644
--- a/chrome/browser/component_updater/crx_update_item.h
+++ b/chrome/browser/component_updater/crx_update_item.h
@@ -17,8 +17,6 @@
 
 namespace component_updater {
 
-class CUResourceThrottle;
-
 // This is the one and only per-item state structure. Designed to be hosted
 // in a std::vector or a std::list. The two main members are |component|
 // which is supplied by the the component updater client and |status| which
@@ -110,7 +108,7 @@ struct CrxUpdateItem {
 
   std::vector<CrxDownloader::DownloadMetrics> download_metrics;
 
-  std::vector<base::WeakPtr<CUResourceThrottle> > throttles;
+  std::vector<base::Closure> ready_callbacks;
 
   CrxUpdateItem();
   ~CrxUpdateItem();