Move code in components/safe_browsing_db and chrome/browser/s_b/ under the safe_browsing namespace.

chrome/browser/safe_browsing/safe_browsing_api_handler.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/safe_browsing/safe_browsing_api_handler.h"
 
+namespace safe_browsing {
+
 SafeBrowsingApiHandler* SafeBrowsingApiHandler::instance_ = NULL;
 
 // static
 void SafeBrowsingApiHandler::SetInstance(SafeBrowsingApiHandler* instance) {
   instance_ = instance;
 }
 
 // static
 SafeBrowsingApiHandler* SafeBrowsingApiHandler::GetInstance() {
   return instance_;
 }
+
+}  // namespace safe_browsing