Options: Simplify access to the instant.confirm_dialog_shown preference.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/6591062

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@76649 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 21 insertions, 11 deletions

diff --git a/chrome/browser/resources/options/browser_options.html b/chrome/browser/resources/options/browser_options.html
index e79d702..d8244c1 100644
--- a/chrome/browser/resources/options/browser_options.html
+++ b/chrome/browser/resources/options/browser_options.html
@@ -89,10 +89,6 @@
             <input type="checkbox" id="instantEnableCheckbox"
                 pref="instant.enabled">
             <span i18n-content="instantName"></span>
-            <!-- This hidden checkbox allows us to get/set the state of the
-                 confirm_dialog_shown pref -->
-            <input type="checkbox" class="hidden" id="instantDialogShown"
-                pref="instant.confirm_dialog_shown">
           </label>
         </div>
         <div class="suboption informational-text">
diff --git a/chrome/browser/resources/options/browser_options.js b/chrome/browser/resources/options/browser_options.js
index 6f5a2a7..2819807 100644
--- a/chrome/browser/resources/options/browser_options.js
+++ b/chrome/browser/resources/options/browser_options.js
@@ -34,6 +34,9 @@ cr.define('options', function() {
       'managed': false
     },
 
+    // The cached value of the instant.confirm_dialog_shown preference.
+    instantConfirmDialogShown_: false,
+
     /**
      * Initialize BrowserOptions page.
      */
@@ -53,17 +56,20 @@ cr.define('options', function() {
         chrome.send('coreOptionsUserMetricsAction',
             ['Options_ManageSearchEngines']);
       };
-      $('instantEnableCheckbox').onclick = function(event) {
-        var alreadyConfirmed = $('instantDialogShown').checked;
+      $('defaultSearchEngine').onchange = this.setDefaultSearchEngine;
 
-        if (this.checked && !alreadyConfirmed) {
+      var self = this;
+      $('instantEnableCheckbox').onclick = function(event) {
+        if (this.checked && !self.instantConfirmDialogShown_) {
           // Leave disabled for now. The PrefCheckbox handler already set it to
           // true so undo that.
           Preferences.setBooleanPref(this.pref, false, this.metric);
           OptionsPage.navigateToPage('instantConfirm');
         }
       };
-      $('defaultSearchEngine').onchange = this.setDefaultSearchEngine;
+
+      Preferences.getInstance().addEventListener('instant.confirm_dialog_shown',
+          this.onInstantConfirmDialogShownChanged_.bind(this));
 
       var homepageField = $('homepageURL');
       $('homepageUseNTPButton').onchange =
@@ -112,6 +118,16 @@ cr.define('options', function() {
     },
 
     /**
+     * Called when the value of the instant.confirm_dialog_shown preference
+     * changes. Cache this value.
+     * @param {Event} event Change event.
+     * @private
+     */
+    onInstantConfirmDialogShownChanged_: function(event) {
+      this.instantConfirmDialogShown_ = event.value['value'];
+    },
+
+    /**
      * Update the Default Browsers section based on the current state.
      * @private
      * @param {string} statusString Description of the current default state.
diff --git a/chrome/browser/resources/options/instant_confirm_overlay.js b/chrome/browser/resources/options/instant_confirm_overlay.js
index 3ba9793..9f983c7 100644
--- a/chrome/browser/resources/options/instant_confirm_overlay.js
+++ b/chrome/browser/resources/options/instant_confirm_overlay.js
@@ -25,9 +25,7 @@ cr.define('options', function() {
       };
       $('instantConfirmOk').onclick = function() {
         OptionsPage.closeOverlay();
-        var instantDialogShown = $('instantDialogShown');
-        Preferences.setBooleanPref(instantDialogShown.pref, true,
-                                   instantDialogShown.metric);
+        Preferences.setBooleanPref('instant.confirm_dialog_shown', true);
         var instantEnabledCheckbox = $('instantEnableCheckbox');
         Preferences.setBooleanPref(instantEnableCheckbox.pref, true,
                                    instantEnableCheckbox.metric);