Update from https://crrev.com/333737

base/prefs/pref_service.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 "base/prefs/pref_service.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
@@ skipping 88 matching lines @@
         base::Bind(&PersistentPrefStore::ReadPrefsAsync, user_pref_store_.get(),
                    new ReadErrorHandler(read_error_callback_)));
   }
 }
 
 void PrefService::CommitPendingWrite() {
   DCHECK(CalledOnValidThread());
   user_pref_store_->CommitPendingWrite();
 }
 
+void PrefService::SchedulePendingLossyWrites() {
+  DCHECK(CalledOnValidThread());
+  user_pref_store_->SchedulePendingLossyWrites();
+}
+
 bool PrefService::GetBoolean(const std::string& path) const {
   DCHECK(CalledOnValidThread());
 
   bool result = false;
 
   const base::Value* value = GetPreferenceValue(path);
   if (!value) {
     NOTREACHED() << "Trying to read an unregistered pref: " << path;
     return result;
   }
@@ skipping 481 matching lines @@
       DCHECK(found_value->IsType(default_type));
       return found_value;
     } else {
       // Every registered preference has at least a default value.
       NOTREACHED() << "no valid value found for registered pref " << path;
     }
   }
 
   return NULL;
 }