Download Service : Added leveldb proto layer

components/download/internal/model.h

Index: components/download/internal/model.h
diff --git a/components/download/internal/model.h b/components/download/internal/model.h
index ce5de88e4500878f1f7667c461b30cfb53991144..6b98cdc05f12d18aee5e5e83c0b04005af6b9d40 100644
--- a/components/download/internal/model.h
+++ b/components/download/internal/model.h
@@ -32,10 +32,9 @@ class Model {
     // callback.  If |success| is true it can be accessed now.
     virtual void OnInitialized(bool success) = 0;
 
-    // Called asynchronously in response to a Model::Destroy call.  If |success|
-    // is |false|, destruction of the Model and/or the underlying Store failed.
+    // Called asynchronously in response to a Model::Destroy call.
     // Destruction of the Model is effectively complete after this callback.
-    virtual void OnDestroyed(bool success) = 0;
+    virtual void OnDestroyed() = 0;
 
     // Called when an Entry addition is complete.  |success| determines whether
     // or not the entry has been successfully persisted to the Store.