MediaRouter: Adjust the bottom margin of the chooser texts

Change-Id: I71eb3404822140a7ae003747080cd9e57fb40fb2
diff --git a/v7/mediarouter/res/layout/mr_chooser_list_item.xml b/v7/mediarouter/res/layout/mr_chooser_list_item.xml
index a363ab0..d578560 100644
--- a/v7/mediarouter/res/layout/mr_chooser_list_item.xml
+++ b/v7/mediarouter/res/layout/mr_chooser_list_item.xml
@@ -30,7 +30,7 @@
 
     <LinearLayout android:layout_width="fill_parent"
                   android:layout_height="wrap_content"
-                  android:layout_marginBottom="2.5dp"
+                  android:layout_marginBottom="1dp"
                   android:orientation="vertical" >
 
         <TextView android:id="@+id/mr_chooser_route_name"