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

Index: chrome/browser/safe_browsing/test_database_manager.h
diff --git a/chrome/browser/safe_browsing/test_database_manager.h b/chrome/browser/safe_browsing/test_database_manager.h
index ad07208d7a4c6b550e878c1582d2e4c9ccb73e7b..0ed8b255b74b0ad6ff868b7f874a43ee7720c138 100644
--- a/chrome/browser/safe_browsing/test_database_manager.h
+++ b/chrome/browser/safe_browsing/test_database_manager.h
@@ -11,6 +11,8 @@
 
 #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.
@@ -42,4 +44,7 @@ class TestSafeBrowsingDatabaseManager
  protected:
   ~TestSafeBrowsingDatabaseManager() override {};
 };
+
+}  // namespace safe_browsing
+
 #endif  // CHROME_BROWSER_SAFE_BROWSING_TEST_DATABASE_MANAGER_H_