Fix WebsitePreference::compareTo.

Should not return constant when compared against object of class Preference.

BUG=450862

Review URL: https://codereview.chromium.org/875003002

Cr-Commit-Position: refs/heads/master@{#314135}

chrome/android/java/src/org/chromium/chrome/browser/preferences/website/WebsitePreference.java

@@ -116,7 +116,7 @@ class WebsitePreference extends Preference implements FaviconImageCallback {
     @Override
     public int compareTo(Preference preference) {
         if (!(preference instanceof WebsitePreference)) {
-            return 1;
+            return super.compareTo(preference);
         }
         WebsitePreference other = (WebsitePreference) preference;
         if (mFilter.showStorageSites(mCategoryFilter)) {