Merge changes I651c570b,I0d571918

* changes:
  Switch padding to margin in header
  Fix Gerrit global scoping issue

polygerrit-ui/app/elements/core/gr-main-header/gr-main-header.html

@@ -53,7 +53,7 @@ limitations under the License.
         content: "";
         display: inline-block;
         height: var(--header-icon-size);
-        padding-right: calc(var(--header-icon-size) / 4);
+        margin-right: calc(var(--header-icon-size) / 4);
         vertical-align: text-bottom;
         width: var(--header-icon-size);
       }

polygerrit-ui/app/elements/gr-app.html

@@ -29,6 +29,7 @@ limitations under the License.
   // Needed for JSCompiler to understand it's global.
   // eslint-disable-next-line no-unused-vars, prefer-const
   let Gerrit = window.Gerrit || {};
+  window.Gerrit = Gerrit;
 </script>
 
 <link rel="import" href="../bower_components/polymer/polymer.html">

polygerrit-ui/app/embed/embed.html

@@ -18,6 +18,7 @@ limitations under the License.
   // Needed for JSCompiler to understand it's global.
   // eslint-disable-next-line no-unused-vars, prefer-const
   let Gerrit = window.Gerrit || {};
+  window.Gerrit = Gerrit;
 </script>
 <link rel="import" href="../bower_components/polymer/polymer.html">
 <link rel="import" href="../elements/change/gr-change-view/gr-change-view.html">

polygerrit-ui/app/gr-diff/gr-diff-root.html

@@ -2,5 +2,6 @@
   // Needed for JSCompiler to understand it's global.
   // eslint-disable-next-line no-unused-vars, prefer-const
   let Gerrit = window.Gerrit || {};
+  window.Gerrit = Gerrit;
 </script>
-<link rel="import" href="../elements/diff/gr-diff/gr-diff.html">
+<link rel="import" href="../elements/diff/gr-diff/gr-diff.html">