Change Settings static element map access to query selector

CL 2088233 wrapped some elements on the privacy page into dom-if's such
that they no longer appear in the static element map accessed with .$.

Code that relied on these elements existing in this map thus failed.
This CL changes these call sites to instead use the query selector $$
call, which will successfully return the elements inside a dom-if.

Bug: 1058960
Change-Id: I2e0380a7e5f4251865f5ae809037401fccbc7446
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2090456
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747434}

chrome/browser/resources/settings/privacy_page/privacy_page.js

@@ -446,7 +446,7 @@ cr.define('settings', function() {
 
     /** @private */
     onDoNotTrackDialogClosed_() {
-      cr.ui.focusWithoutInk(this.$.doNotTrack);
+      cr.ui.focusWithoutInk(assert(this.$$('#doNotTrack')));
     },
 
     /**
@@ -454,7 +454,7 @@ cr.define('settings', function() {
      * @private
      */
     onDoNotTrackDialogConfirm_() {
-      /** @type {!SettingsToggleButtonElement} */ (this.$.doNotTrack)
+      /** @type {!SettingsToggleButtonElement} */ (this.$$('#doNotTrack'))
           .sendPrefChange();
       this.closeDoNotTrackDialog_();
     },
@@ -465,7 +465,7 @@ cr.define('settings', function() {
      * @private
      */
     onDoNotTrackDialogCancel_() {
-      /** @type {!SettingsToggleButtonElement} */ (this.$.doNotTrack)
+      /** @type {!SettingsToggleButtonElement} */ (this.$$('#doNotTrack'))
           .resetToPrefValue();
       this.closeDoNotTrackDialog_();
     },
@@ -543,7 +543,7 @@ cr.define('settings', function() {
     onDialogClosed_() {
       settings.Router.getInstance().navigateTo(
           settings.routes.CLEAR_BROWSER_DATA.parent);
-      cr.ui.focusWithoutInk(assert(this.$.clearBrowsingData));
+      cr.ui.focusWithoutInk(assert(this.$$('#clearBrowsingData')));
     },
 
     /** @private */