Revert of Remove special theming for CardUnmaskPrompt since it's now automatic

chrome/android/java/res/values-v17/styles.xml

 <?xml version="1.0" encoding="utf-8"?>
 <!-- Copyright 2014 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. -->
 
 <resources>
+    <!-- A theme for alert dialogs. The colors are copied from MainTheme, and the window
+         dimensions are copied from *.MinWidth theme variants. Sadly there is no
+         AppCompat.Light.Dialog.Alert or even AppCompat.Light.Dialog.MinWidth. -->
+    <style name="AlertDialogTheme" parent="Theme.AppCompat.Light.Dialog">
+        <item name="android:textColorHighlight">@color/text_highlight_color</item>
+        <item name="android:windowMinWidthMajor">@android:dimen/dialog_min_width_major</item>
+        <item name="android:windowMinWidthMinor">@android:dimen/dialog_min_width_minor</item>
+
+        <!--  Overriding AppCompat values -->
+        <item name="colorAccent">@color/light_active_color</item>
+        <item name="colorControlActivated">@color/light_active_color</item>
+        <item name="colorControlNormal">@color/light_normal_color</item>
+        <item name="colorPrimary">@color/light_active_color</item>
+
+        <!-- Default TintedImageButton tint -->
+        <item name="tint">@color/dark_mode_tint</item>
+    </style>
+
     <!-- Preferences -->
     <style name="PreferencesTheme" parent="ThemeWithActionBar">
         <item name="android:textColorLink">@color/pref_accent_color</item>
         <item name="android:textAppearanceMedium">@style/PreferenceTextAppearanceMedium</item>
         <item name="android:preferenceCategoryStyle">@style/PreferenceCategory</item>
         <item name="android:spinnerItemStyle">@style/PreferenceSpinnerItem</item>
         <item name="floatLabelTextAppearance">@style/PreferenceFloatLabelTextAppearance</item>
         <item name="floatLabelPaddingLeft">@dimen/pref_autofill_field_horizontal_padding</item>
         <item name="floatLabelPaddingRight">@dimen/pref_autofill_field_horizontal_padding</item>
         <item name="floatLabelPaddingTop">@dimen/pref_autofill_field_top_padding</item>
@@ skipping 220 matching lines @@
     <style name="CastMediaRouteButton" parent="@style/Widget.MediaRouter.MediaRouteButton">
         <item name="android:background">@null</item>
         <item name="android:paddingTop">0dp</item>
         <item name="android:paddingBottom">0dp</item>
         <item name="android:paddingStart">0dp</item>
         <item name="android:paddingEnd">0dp</item>
         <item name="externalRouteEnabledDrawable">@drawable/ic_cast_dark_chrome</item>
     </style>
     
 </resources>