Fix tests on Firefox.

Author: Steven Orvell

test/unit/shady-unscoped-style.html

@@ -94,7 +94,7 @@
     });
 
     test('shared and @apply apply when used with unscoped styles', function() {
-      assertComputed(el1.$.fromStyle, '10px', 'padding');
+      assertComputed(el1.$.fromStyle, '10px', 'padding-top');
       assertComputed(el1.$.normal, '3px');
       assertComputed(el2.$.normal, '3px');
     })
@@ -110,8 +110,8 @@
       if (Polymer.Settings.useNativeShadow) {
         this.skip();
       }
-      assertComputed(el1.$.fromStyle, '0px', 'margin');
-      assertComputed(el2.$.fromStyle, '0px', 'margin');
+      assertComputed(el1.$.fromStyle, '0px', 'margin-top');
+      assertComputed(el2.$.fromStyle, '0px', 'margin-top');
     })