Don't show exclusive toggle for 'owner' permissions

In the GWT UI, the checkbox is always disabled. The owner permission
does not allow exclusive to be set. This change only shows the exclusive
toggle if the permission is not 'owner'

Change-Id: I3a3be5aefd661c84e51a84900b3eade6b4b6ef60

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

@@ -89,11 +89,13 @@ limitations under the License.
         <div class="header">
           <span class="title">[[name]]</span>
           <div class="right">
-            <paper-toggle-button
-                id="exclusiveToggle"
-                checked="{{permission.value.exclusive}}"
-                on-change="_handleValueChange"
-                disabled$="[[!editing]]"></paper-toggle-button>Exclusive
+            <template is=dom-if if="[[!_permissionIsOwner(permission.id)]]">
+              <paper-toggle-button
+                  id="exclusiveToggle"
+                  checked="{{permission.value.exclusive}}"
+                  on-change="_handleValueChange"
+                  disabled$="[[!editing]]"></paper-toggle-button>Exclusive
+            </template>
             <gr-button
                 link
                 id="removeBtn"

polygerrit-ui/app/elements/admin/gr-permission/gr-permission.js

@@ -89,6 +89,10 @@
       this._setupValues();
     },
 
+    _permissionIsOwner(permissionId) {
+      return permissionId === 'owner';
+    },
+
     _handleEditingChanged(editing, editingOld) {
       // Ignore when editing gets set initially.
       if (!editingOld) { return; }

polygerrit-ui/app/elements/admin/gr-permission/gr-permission_test.html

@@ -335,7 +335,7 @@ limitations under the License.
 
         assert.isFalse(element._originalExclusiveValue);
         assert.isNotOk(element.permission.value.modified);
-        MockInteractions.tap(element.$.exclusiveToggle);
+        MockInteractions.tap(element.$$('#exclusiveToggle'));
         flushAsynchronousOperations();
         assert.isTrue(element.permission.value.exclusive);
         assert.isTrue(element.permission.value.modified);
@@ -353,6 +353,15 @@ limitations under the License.
         assert.isTrue(element.permission.value.modified);
         assert.isTrue(modifiedHandler.called);
       });
+
+      test('Exclusive hidden for owner permission', () => {
+        assert.equal(getComputedStyle(element.$$('#exclusiveToggle')).display,
+            'flex');
+        element.set(['permission', 'id'], 'owner');
+        flushAsynchronousOperations();
+        assert.equal(getComputedStyle(element.$$('#exclusiveToggle')).display,
+            'none');
+      });
     });
   });
 </script>