Fix a race condition in preference metric reporting.

chrome/service/service_process_prefs.cc

 // Copyright (c) 2011 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 "chrome/service/service_process_prefs.h"
 
 #include "base/message_loop/message_loop_proxy.h"
+#include "base/prefs/pref_filter.h"
 #include "base/values.h"
 
 ServiceProcessPrefs::ServiceProcessPrefs(
     const base::FilePath& pref_filename,
     base::SequencedTaskRunner* task_runner)
-    : prefs_(new JsonPrefStore(pref_filename, task_runner)) {
+    : prefs_(new JsonPrefStore(pref_filename,
+                               task_runner,
+                               scoped_ptr<PrefFilter>())) {
 }
 
 ServiceProcessPrefs::~ServiceProcessPrefs() {}
 
 void ServiceProcessPrefs::ReadPrefs() {
   prefs_->ReadPrefs();
 }
 
 void ServiceProcessPrefs::WritePrefs() {
   prefs_->CommitPendingWrite();
@@ skipping 64 matching lines @@
 }
 
 void ServiceProcessPrefs::SetValue(const std::string& key, base::Value* value) {
   prefs_->SetValue(key, value);
 }
 
 void ServiceProcessPrefs::RemovePref(const std::string& key) {
   prefs_->RemoveValue(key);
 }