Add synchronous callback support to important_file_writer.cc

components/prefs/json_pref_store.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 "components/prefs/json_pref_store.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <utility>
@@ skipping 305 matching lines @@
   DCHECK(CalledOnValidThread());
 
   if (pref_filter_)
     pref_filter_->FilterUpdate(key);
 
   FOR_EACH_OBSERVER(PrefStore::Observer, observers_, OnPrefValueChanged(key));
 
   ScheduleWrite(flags);
 }
 
-void JsonPrefStore::RegisterOnNextSuccessfulWriteCallback(
-    const base::Closure& on_next_successful_write) {
+void JsonPrefStore::RegisterOnNextSuccessfulWriteReply(
+    const base::Closure& on_next_successful_write_reply) {
   DCHECK(CalledOnValidThread());
 
-  writer_.RegisterOnNextSuccessfulWriteCallback(on_next_successful_write);
+  writer_.RegisterOnNextSuccessfulWriteReply(on_next_successful_write_reply);
 }
 
 void JsonPrefStore::ClearMutableValues() {
   NOTIMPLEMENTED();
 }
 
 void JsonPrefStore::OnFileRead(std::unique_ptr<ReadResult> read_result) {
   DCHECK(CalledOnValidThread());
 
   DCHECK(read_result);
@@ skipping 192 matching lines @@
   DCHECK_EQ(31, num_buckets);
 
   // The histogram below is an expansion of the UMA_HISTOGRAM_CUSTOM_COUNTS
   // macro adapted to allow for a dynamically suffixed histogram name.
   // Note: The factory creates and owns the histogram.
   base::HistogramBase* histogram = base::Histogram::FactoryGet(
       histogram_name, min_value, max_value, num_buckets,
       base::HistogramBase::kUmaTargetedHistogramFlag);
   return histogram;
 }