[sync] Clean up path generation for the local sync database.

components/sync/driver/sync_client.h

Index: components/sync/driver/sync_client.h
diff --git a/components/sync/driver/sync_client.h b/components/sync/driver/sync_client.h
index bf9ab4cec3fb760ff290d1161779e27b51de0cde..2ef19de1262981864361d41d7b153ff07c9d6841 100644
--- a/components/sync/driver/sync_client.h
+++ b/components/sync/driver/sync_client.h
@@ -67,6 +67,10 @@ class SyncClient {
   // Returns the current profile's preference service.
   virtual PrefService* GetPrefService() = 0;
 
+  // Returns the path to the folder used for storing the local sync database.
+  // It is only used when sync is running against its local backend.

[Nicolas Zea, 2017/02/27 19:21:26]

nit: "its local backend" -> "a local backend"

[pastarmovj, 2017/02/28 17:22:33]

Done.

+  virtual base::FilePath GetLocalSyncBackendFolder() = 0;
+
   // DataType specific service getters.
   virtual bookmarks::BookmarkModel* GetBookmarkModel() = 0;
   virtual favicon::FaviconService* GetFaviconService() = 0;