Implement ping_freshness for update_client.

components/update_client/update_engine.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 "components/update_client/update_engine.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/location.h"
 #include "base/stl_util.h"
@@ skipping 82 matching lines @@
     return;
   }
 
   scoped_ptr<UpdateContext> update_context(new UpdateContext(
       config_, is_foreground, ids, crx_data_callback,
       notify_observers_callback_, callback, update_checker_factory_,
       crx_downloader_factory_, ping_manager_));
 
   CrxUpdateItem update_item;
   scoped_ptr<ActionUpdateCheck> update_check_action(new ActionUpdateCheck(
-      (*update_context->update_checker_factory)(config_, *metadata_),
+      (*update_context->update_checker_factory)(config_, metadata_.get()),
       config_->GetBrowserVersion(), config_->ExtraRequestParams()));
 
   update_context->current_action.reset(update_check_action.release());
   update_contexts_.insert(update_context.get());
 
   update_context->current_action->Run(
       update_context.get(),
       base::Bind(&UpdateEngine::UpdateComplete, base::Unretained(this),
                  update_context.get()));
 
@@ skipping 30 matching lines @@
 
   const auto now(base::Time::Now());
 
   // Throttle the calls in the interval (t - 1 day, t) to limit the effect of
   // unset clocks or clock drift.
   return throttle_updates_until_ - base::TimeDelta::FromDays(1) < now &&
          now < throttle_updates_until_;
 }
 
 }  // namespace update_client