Remove global updateInbox method

This operation now needs to be done exactly once, at startup, so we
don't need to expose a global method for it.

// FREEBIE

js/background.js

@@ -18,8 +18,6 @@
 
     textsecure.protocol_wrapper.startWorker();
 
-    ConversationController.updateInbox();
-
     extension.onLaunched(function() {
         storage.onready(function() {
             if (textsecure.registration.isDone()) {

js/conversation_controller.js

@@ -37,6 +37,9 @@
         }
     }))();
 
+    // Load the initial set of models for the inbox.
+    conversations.fetchActive();
+
     window.getInboxCollection = function() {
         return inboxCollection;
     };
@@ -68,9 +71,6 @@
                     }
                 });
             });
-        },
-        updateInbox: function() {
-            conversations.fetchActive();
         }
     };
 })();