Add mojom module suffix in .mojom files in content.

content/common/leveldb_wrapper.mojom

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module content;
+module content.mojom;
 
 import "components/leveldb/public/interfaces/leveldb.mojom";
 
 // Gives information about changes to a LevelDB database.
 // The reason this is a parameter to DeleteAll and GetAll below, instead of
 // being specified when opening a LevelDBWrapper, is to avoid the client getting
 // callbacks for changes that have already been applied to its database that
 // it's fetching via GetAll or it's clearing via DeleteAll.
 // In the methods below, |source| is a user-defined string which was passed to
 // the various LevelDBWrapper methods.
@@ skipping 28 matching lines @@
     => (leveldb.DatabaseError status);
 
   // Returns the value of the |key|.
   Get(array<uint8> key) => (leveldb.DatabaseError status, array<uint8> value);
 
   // Only used with small databases. Returns all key/value pairs.
   [Sync]
   GetAll(LevelDBObserver observer)
     => (leveldb.DatabaseError status, array<KeyValue> data);
 };