fix bookmarks context menu style

    http://b/issue?id=3055537

Change-Id: I3fc825630a4bb62be0fba5dd7f92fd41b21aae61
diff --git a/res/values-xlarge/styles.xml b/res/values-xlarge/styles.xml
index 375e3c6..0420495 100644
--- a/res/values-xlarge/styles.xml
+++ b/res/values-xlarge/styles.xml
@@ -40,8 +40,15 @@
         <item name="android:windowSoftInputMode">stateUnspecified|adjustPan</item>
         <item name="android:colorBackgroundCacheHint">@null</item>
     </style>
-    <style name="BookmarkTheme" parent="@android:Theme.Panel">
-        <item name="android:windowBackground">@color/black</item>
+    <style name="BookmarkTheme" parent="@android:Theme.Holo">
+        <item name="android:windowActionBar">false</item>
+        <item name="android:windowNoTitle">true</item>
+        <item name="android:colorBackgroundCacheHint">@null</item>
+        <item name="android:windowFrame">@null</item>
+        <item name="android:windowContentOverlay">@null</item>
+        <item name="android:windowIsFloating">true</item>
+        <item name="android:backgroundDimEnabled">false</item>
+        <item name="android:windowIsTranslucent">true</item>
     </style>
     <style name="ShortCutTheme" parent="@android:Theme.Holo">
         <item name="android:windowContentOverlay">@null</item>