Download Service : Added leveldb proto layer

components/download/internal/store.h

Index: components/download/internal/store.h
diff --git a/components/download/internal/store.h b/components/download/internal/store.h
index 04a39bffcc6ee7b0cab733d46cbe90bbd32d8af6..06cf6ce2ceee26b3e00aae6b67594cb5b3447841 100644
--- a/components/download/internal/store.h
+++ b/components/download/internal/store.h
@@ -10,8 +10,6 @@
 #include <vector>
 
 #include "base/callback_forward.h"
-#include "base/memory/ref_counted.h"
-#include "base/sequenced_task_runner.h"
 
 namespace download {
 
@@ -21,9 +19,9 @@ struct Entry;
 class Store {
  public:
   using InitCallback =
-      base::OnceCallback<void(bool success,
-                              std::unique_ptr<std::vector<Entry>> entries)>;
-  using StoreCallback = base::OnceCallback<void(bool success)>;
+      base::Callback<void(bool success,
+                          std::unique_ptr<std::vector<Entry>> entries)>;
+  using StoreCallback = base::Callback<void(bool success)>;
 
   virtual ~Store() = default;
 
@@ -34,19 +32,20 @@ class Store {
   // Initializes this Store and asynchronously returns whether or not that
   // initialization was successful as well as a list of Entry objects from the
   // Store.
-  virtual void Initialize(InitCallback callback) = 0;
+  virtual void Initialize(const InitCallback& callback) = 0;
 
   // Destroyes the store and asynchronously returns whether or not that
   // destruction was successful.
-  virtual void Destroy(StoreCallback callback) = 0;
+  virtual void Destroy(const StoreCallback& callback) = 0;

[David Trainor- moved to gerrit, 2017/05/24 15:31:21]

Let's remove this... I think I misunderstood what this does.  nyquist@ pointed
out that this deletes the database! :(  Check and remove if so.  Thanks!

[shaktisahu, 2017/05/24 18:29:01]

Yes, this would delete the database. Removed.

 
   // Adds or updates |entry| in this Store asynchronously and returns whether or
   // not that was successful.
-  virtual void Update(const Entry& entry, StoreCallback callback) = 0;
+  virtual void Update(const Entry& entry, const StoreCallback& callback) = 0;
 
   // Removes the Entry associated with |guid| from this Store asynchronously and
   // returns whether or not that was successful.
-  virtual void Remove(const std::string& guid, StoreCallback callback) = 0;
+  virtual void Remove(const std::string& guid,
+                      const StoreCallback& callback) = 0;
 };
 
 }  // namespace download