Fix the build.

Use a local resource instead of a non-existent
framework one.
diff --git a/res/layout/bookmark_thumbnail.xml b/res/layout/bookmark_thumbnail.xml
index 439145a..57f59eb 100644
--- a/res/layout/bookmark_thumbnail.xml
+++ b/res/layout/bookmark_thumbnail.xml
@@ -21,7 +21,7 @@
     android:background="@color/white">
 
     <ImageView android:id="@+id/thumb"
-        android:src="@android:drawable/app_web_browser_sm"
+        android:src="@drawable/app_web_browser_sm"
         android:scaleType="center"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent" />