[geary] Remove border around conversation viewer's scrolled window.

[Michael Gratton <mjog src gnome org>]

commit 56179ba066d660178f3990e6a372a18a1096d788
Author: Michael James Gratton <mike vee net>
Date:   Fri Dec 9 15:36:06 2016 +1100

    Remove border around conversation viewer's scrolled window.

 ui/conversation-viewer.ui |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/ui/conversation-viewer.ui b/ui/conversation-viewer.ui
index fbb6434..e666ea2 100644
--- a/ui/conversation-viewer.ui
+++ b/ui/conversation-viewer.ui
@@ -125,10 +125,12 @@
             <property name="hexpand">True</property>
             <property name="vexpand">True</property>
             <property name="hscrollbar_policy">never</property>
-            <property name="shadow_type">in</property>
             <child>
               <placeholder/>
             </child>
+            <style>
+              <class name=".geary-conversation-scroller"/>
+            </style>
           </object>
           <packing>
             <property name="left_attach">0</property>