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

chrome/browser/safe_browsing/test_database_manager.h

 // 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.
 
 #ifndef CHROME_BROWSER_SAFE_BROWSING_TEST_DATABASE_MANAGER_H_
 #define CHROME_BROWSER_SAFE_BROWSING_TEST_DATABASE_MANAGER_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "chrome/browser/safe_browsing/database_manager.h"
 
+namespace safe_browsing {
+
 // This is a non-pure-virtual implementation of the SafeBrowsingDatabaseManager
 // interface.  It's used in tests by overriding only the functions that get
 // called, and it'll complain if you call one that isn't overriden.
 class TestSafeBrowsingDatabaseManager
     : public SafeBrowsingDatabaseManager {
  public:
   // SafeBrowsingDatabaseManager implementation:
   bool IsSupported() const override;
   bool ChecksAreAlwaysAsync() const override;
   bool CanCheckResourceType(content::ResourceType resource_type) const override;
@@ skipping 11 matching lines @@
   bool MatchInclusionWhitelistUrl(const GURL& url) override;
   bool IsMalwareKillSwitchOn() override;
   bool IsCsdWhitelistKillSwitchOn() override;
   void CancelCheck(Client* client) override;
   void StartOnIOThread() override;
   void StopOnIOThread(bool shutdown) override;
 
  protected:
   ~TestSafeBrowsingDatabaseManager() override {};
 };
+
+}  // namespace safe_browsing
+
 #endif  // CHROME_BROWSER_SAFE_BROWSING_TEST_DATABASE_MANAGER_H_