Move remote_db_manager into the safe_browsing_db component.

components/safe_browsing_db/metadata.proto

 // Copyright 2014 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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package safe_browsing;
 
 // Everything below this comment was copied from the page
 // <https://developers.google.com/safe-browsing/developers_guide_v3>,
 // section "Full Hash Metadata".
 
 // Metadata for the goog-malware-shavar list.
 message MalwarePatternType {
   enum PATTERN_TYPE {
     LANDING = 1;
     DISTRIBUTION = 2;
   }
 
   required PATTERN_TYPE pattern_type = 1;
 }