dom-ui settings: Add setting for setting the minimum font size....

chrome/browser/resources/options/preferences.js

 // Copyright (c) 2010 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.
 
 cr.define('options', function() {
 
   /////////////////////////////////////////////////////////////////////////////
   // Preferences class:
 
   /**
@@ skipping 70 matching lines @@
    * @param {string} name Preference name.
    * @param {string} value New preference value.
    * @param {string} metric User metrics identifier.
    */
   Preferences.setObjectPref = function(name, value, metric) {
     var arguments = [name, JSON.stringify(value)];
     if (metric != undefined) arguments.push(metric);
     chrome.send('setObjectPref', arguments);
   };
 
+  /**
+   * Clears value of a JSON preference.
+   * @param {string} name Preference name.
+   * @param {string} metric User metrics identifier.
+   */
+  Preferences.clearPref = function(name, metric) {
+    var arguments = [name];
+    if (metric != undefined) arguments.push(metric);
+    chrome.send('clearPref', arguments);
+  };
+
   Preferences.prototype = {
     __proto__: cr.EventTarget.prototype,
 
     // Map of registered preferences.
     registeredPreferences_: {},
 
     /**
      * Adds an event listener to the target.
      * @param {string} type The name of the event.
      * @param {!Function|{handleEvent:Function}} handler The handler for the
@@ skipping 59 matching lines @@
     Preferences.getInstance().dispatchEvent(event);
   };
 
   // Export
   return {
     Preferences: Preferences
   };
 
 });