MD Settings: change outlinks to actually use <a>

chrome/browser/resources/settings/appearance_page/appearance_page.js

Index: chrome/browser/resources/settings/appearance_page/appearance_page.js
diff --git a/chrome/browser/resources/settings/appearance_page/appearance_page.js b/chrome/browser/resources/settings/appearance_page/appearance_page.js
index 5571b2d249929d5d2f22da0ac953f2ef182dc7fd..37a6a96e37471eeacc024b68ee7b96fa06e25525 100644
--- a/chrome/browser/resources/settings/appearance_page/appearance_page.js
+++ b/chrome/browser/resources/settings/appearance_page/appearance_page.js
@@ -94,6 +94,9 @@ Polymer({
     themeSublabel_: String,
 
     /** @private */
+    themeUrl_: String,
+
+    /** @private */
     useSystemTheme_: {
       type: Boolean,
       value: false,  // Can only be true on Linux, but value exists everywhere.
@@ -115,9 +118,6 @@ Polymer({
   /** @private {?settings.AppearanceBrowserProxy} */
   browserProxy_: null,
 
-  /** @private {string} */
-  themeUrl_: '',
-
   observers: [
     'defaultFontSizeChanged_(prefs.webkit.webprefs.default_font_size.value)',
     'themeChanged_(prefs.extensions.theme.id.value, useSystemTheme_)',
@@ -187,9 +187,13 @@ Polymer({
         value - SIZE_DIFFERENCE_FIXED_STANDARD_);
   },
 
-  /** @private */
-  onThemesTap_: function() {
-    window.open(this.themeUrl_ || loadTimeData.getString('themesGalleryUrl'));
+  /**
+   * URL for either current theme or the theme gallery.
+   * @return {string}
+   * @private
+   */
+  getThemeHref_: function() {
+    return this.themeUrl_ || loadTimeData.getString('themesGalleryUrl');
   },
 
   // <if expr="chromeos">