Simplify the ApplicationLoader interface in preparation for changes.

shell/android/ui_application_loader_android.h

Index: shell/android/ui_application_loader_android.h
diff --git a/shell/android/ui_application_loader_android.h b/shell/android/ui_application_loader_android.h
index e7933c60e08b9605156a7297ae9ef9b7ac8a995a..06ccc09c8e9aa3a3c0dd0df4d60a9dbf9a127b21 100644
--- a/shell/android/ui_application_loader_android.h
+++ b/shell/android/ui_application_loader_android.h
@@ -27,10 +27,8 @@ class UIApplicationLoader : public ApplicationLoader {
   ~UIApplicationLoader() override;
 
   // ApplicationLoader overrides:
-  void Load(ApplicationManager* manager,
-            const GURL& url,
-            InterfaceRequest<Application> application_request,
-            LoadCallback callback) override;
+  void Load(const GURL& url,
+            InterfaceRequest<Application> application_request) override;
   void OnApplicationError(ApplicationManager* manager,
                           const GURL& url) override;
 
@@ -41,8 +39,7 @@ class UIApplicationLoader : public ApplicationLoader {
   // to |background_loader_| to do the actual loading.
   // TODO: having this code take a |manager| is fragile (as ApplicationManager
   // isn't thread safe).
-  void LoadOnUIThread(ApplicationManager* manager,
-                      const GURL& url,
+  void LoadOnUIThread(const GURL& url,
                       InterfaceRequest<Application> application_request);
   void OnApplicationErrorOnUIThread(ApplicationManager* manager,
                                     const GURL& url);