Revert of Replace AttachmentStore's StoreAttachments with UploadAttachments.

sync/internal_api/public/attachments/attachment_service.h

Index: sync/internal_api/public/attachments/attachment_service.h
diff --git a/sync/internal_api/public/attachments/attachment_service.h b/sync/internal_api/public/attachments/attachment_service.h
index 758f960a659b92a6c33fd7518ef6d98b68e7de9b..6ac8cc6993fdbd9f0300c7fd62277122b4c5b1f2 100644
--- a/sync/internal_api/public/attachments/attachment_service.h
+++ b/sync/internal_api/public/attachments/attachment_service.h
@@ -14,7 +14,6 @@
 
 namespace syncer {
 
-class AttachmentStore;
 class SyncData;
 
 // AttachmentService is responsible for managing a model type's attachments.
@@ -45,6 +44,16 @@
 
   typedef base::Callback<void(const DropResult&)> DropCallback;
 
+  // The result of a StoreAttachments operation.
+  enum StoreResult {
+    STORE_SUCCESS,            // No error, all attachments stored (at least
+                              // locally).
+    STORE_UNSPECIFIED_ERROR,  // An unspecified error occurred. Some or all
+                              // attachments may not have been stored.
+  };
+
+  typedef base::Callback<void(const StoreResult&)> StoreCallback;
+
   // An interface that embedder code implements to be notified about different
   // events that originate from AttachmentService.
   // This interface will be called from the same thread AttachmentService was
@@ -61,11 +70,6 @@
   AttachmentService();
   virtual ~AttachmentService();
 
-  // Return a pointer to the AttachmentStore owned by this object.
-  //
-  // May return NULL.
-  virtual AttachmentStore* GetStore() = 0;
-
   // See SyncData::GetOrDownloadAttachments.
   virtual void GetOrDownloadAttachments(
       const AttachmentIdList& attachment_ids,
@@ -75,18 +79,12 @@
   virtual void DropAttachments(const AttachmentIdList& attachment_ids,
                                const DropCallback& callback) = 0;
 
-  // Schedules the attachments identified by |attachment_ids| to be uploaded to
-  // the server.
+  // Store |attachments| on device and (eventually) upload them to the server.
   //
-  // Assumes the attachments are already in the attachment store.
-  //
-  // A request to upload attachments is persistent in that uploads will be
-  // automatically retried if transient errors occur.
-  //
-  // A request to upload attachments does not persist across restarts of Chrome.
-  //
-  // Invokes OnAttachmentUploaded on the Delegate (if provided).
-  virtual void UploadAttachments(const AttachmentIdSet& attachment_ids) = 0;
+  // Invokes |callback| once the attachments have been written to device
+  // storage.
+  virtual void StoreAttachments(const AttachmentList& attachments,
+                                const StoreCallback& callback) = 0;
 };
 
 }  // namespace syncer