Use consistent values for enabled_component_updates throughout an update.

components/update_client/update_engine.h

Index: components/update_client/update_engine.h
diff --git a/components/update_client/update_engine.h b/components/update_client/update_engine.h
index a82864cb0096e3ba121b6b9cf3739c3e471d3637..3ebcc11d071ff0c924fb301ea8a21490a119028c 100644
--- a/components/update_client/update_engine.h
+++ b/components/update_client/update_engine.h
@@ -114,6 +114,9 @@ struct UpdateContext {
   // True if this update has been initiated by the user.
   bool is_foreground;
 
+  // True if the component updates are enabled in this context.
+  const bool enabled_component_updates;
+
   // Contains the ids of all CRXs in this context.
   const std::vector<std::string> ids;