LevelDBDatabase::Compact compacts db (on disk) w/o requiring reopen.

content/browser/indexed_db/leveldb/leveldb_database.cc

Index: content/browser/indexed_db/leveldb/leveldb_database.cc
diff --git a/content/browser/indexed_db/leveldb/leveldb_database.cc b/content/browser/indexed_db/leveldb/leveldb_database.cc
index 8bcb517db41c1b2ba5b5a97fa89292b63a286e31..dd4f085c96098e8f01e0e4fb8ae40b4e28425edf 100644
--- a/content/browser/indexed_db/leveldb/leveldb_database.cc
+++ b/content/browser/indexed_db/leveldb/leveldb_database.cc
@@ -395,6 +395,7 @@ void LevelDBDatabase::Compact(const base::StringPiece& start,
                               const base::StringPiece& stop) {
   const leveldb::Slice start_slice = MakeSlice(start);
   const leveldb::Slice stop_slice = MakeSlice(stop);
+  db_->Write(leveldb::WriteOptions(), NULL);

[jsbell, 2014/07/17 18:33:24]

Please add a comment explaining why this is here.

[cmumford, 2014/07/17 20:51:42]

Done.

   db_->CompactRange(&start_slice, &stop_slice);
 }