Show password sync status in CBD

components/browsing_data/core/counters/browsing_data_counter.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/browsing_data/core/counters/browsing_data_counter.h"
 
 #include <utility>
 
 #include "base/memory/ptr_util.h"
 #include "components/browsing_data/core/browsing_data_utils.h"
@@ skipping 121 matching lines @@
     DoReportResult(std::move(staged_result_));
   } else {
     state_ = State::READY_TO_REPORT_RESULT;
     state_transitions_.push_back(state_);
   }
 }
 
 // BrowsingDataCounter::Result -------------------------------------------------
 
 BrowsingDataCounter::Result::Result(const BrowsingDataCounter* source)
-    : source_(source) {}
+    : source_(source) {
+  DCHECK(source);
+}
 
 BrowsingDataCounter::Result::~Result() {}
 
 bool BrowsingDataCounter::Result::Finished() const {
   return false;
 }
 
 // BrowsingDataCounter::FinishedResult -----------------------------------------
 
 BrowsingDataCounter::FinishedResult::FinishedResult(
     const BrowsingDataCounter* source,
     ResultInt value)
     : Result(source), value_(value) {}
 
 BrowsingDataCounter::FinishedResult::~FinishedResult() {}
 
 bool BrowsingDataCounter::FinishedResult::Finished() const {
   return true;
 }
 
 BrowsingDataCounter::ResultInt BrowsingDataCounter::FinishedResult::Value()
     const {
   return value_;
 }
 
 }  // namespace browsing_data