[Sync] Add interface and backend impl for typed URL syncable service

chrome/browser/history/expire_history_backend_unittest.cc

 // Copyright (c) 2012 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 <algorithm>
 #include <string>
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 161 matching lines @@
   }
 
   // BroadcastNotificationDelegate implementation.
   virtual void BroadcastNotifications(
       int type,
       HistoryDetails* details_deleted) OVERRIDE {
     // This gets called when there are notifications to broadcast. Instead, we
     // store them so we can tell that the correct notifications were sent.
     notifications_.push_back(std::make_pair(type, details_deleted));
   }
+  virtual void NotifySyncURLsDeleted(
+      bool all_history,
+      bool archived,
+      URLRows* rows) OVERRIDE {}
 };
 
 // The example data consists of 4 visits. The middle two visits are to the
 // same URL, while the first and last are for unique ones. This allows a test
 // for the oldest or newest to include both a URL that should get totally
 // deleted (the one on the end) with one that should only get a visit deleted
 // (with the one in the middle) when it picks the proper threshold time.
 //
 // Each visit has indexed data, each URL has thumbnail. The first two URLs will
 // share the same favicon, while the last one will have a unique favicon. The
@@ skipping 829 matching lines @@
   main_db_->GetVisitsForURL(url_id, &archived_visits);
   EXPECT_EQ(0U, archived_visits.size());
 }
 
 // TODO(brettw) add some visits with no URL to make sure everything is updated
 // properly. Have the visits also refer to nonexistent FTS rows.
 //
 // Maybe also refer to invalid favicons.
 
 }  // namespace history