Bug 520614 - Fix usage of vbox in videocontrols.xml. r=enndeakin

toolkit/content/widgets/videocontrols.xml

@@ -194,8 +194,8 @@
     <xbl:content xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
                  class="mediaControlsFrame">
         <stack flex="1">
-            <vbox class="statusOverlay" hidden="true">
-                <box class="statusIcon" flex="1"/>
+            <vbox flex="1" class="statusOverlay" hidden="true">
+                <box class="statusIcon"/>
             </vbox>
 
             <vbox>

toolkit/themes/pinstripe/global/media/videocontrols.css

@@ -151,6 +151,8 @@
 }
 
 .statusOverlay {
+    -moz-box-align: center;
+    -moz-box-pack: center;
     background-color: rgba(0,0,0,0.55);
 }
 

toolkit/themes/winstripe/global/media/videocontrols.css

@@ -160,6 +160,8 @@
 }
 
 .statusOverlay {
+    -moz-box-align: center;
+    -moz-box-pack: center;
     background-color: rgba(0,0,0,0.55);
 }