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

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

Index: chrome/android/java/res/values-v17/styles.xml
diff --git a/chrome/android/java/res/values-v17/styles.xml b/chrome/android/java/res/values-v17/styles.xml
index ef22bc52f16e6cb9ceac5cfc22ab64776b0369c3..10ee0e917adcbf014dd6c981547e6a378bc7e46b 100644
--- a/chrome/android/java/res/values-v17/styles.xml
+++ b/chrome/android/java/res/values-v17/styles.xml
@@ -4,6 +4,24 @@
      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>