Fix crash in ChromeZoomLevelPrefs::ExtractPerHostZoomLevels().

chrome/browser/prefs/browser_prefs.cc

 // Copyright 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 "chrome/browser/prefs/browser_prefs.h"
 
 #include <string>
 
 #include "base/debug/trace_event.h"
 #include "base/metrics/histogram.h"
@@ skipping 666 matching lines @@
 
   const base::DictionaryValue* host_zoom_dictionary =
       prefs->GetDictionary(prefs::kPerHostZoomLevelsDeprecated);
   // Collect stats on frequency with which migrations are occuring. This measure
   // is not perfect, since it will consider an un-migrated user with only
   // default value as being already migrated, but it will catch all non-trivial
   // migrations.
   migrated |= !host_zoom_dictionary->empty();
   UMA_HISTOGRAM_BOOLEAN("Settings.ZoomLevelPreferencesMigrated", migrated);
 
-  zoom_level_prefs->ExtractPerHostZoomLevels(host_zoom_dictionary);
+  zoom_level_prefs->ExtractPerHostZoomLevels(
+      host_zoom_dictionary, prefs::kPerHostZoomLevelsDeprecated);
 
   // We're done migrating the profile per-host zoom level values, so we clear
   // them all.
   DictionaryPrefUpdate host_zoom_dictionary_update(
       prefs, prefs::kPerHostZoomLevelsDeprecated);
   host_zoom_dictionary_update->Clear();
 }
 
 }  // namespace chrome