Merge changes from topic "remove-draft-workflow"

* changes:
  Remove "My Drafts" menu items from all user preferences
  ChangeStatusPredicate: Silently ignore invalid status
  ChangeStatusPredicate: Make protected fields private
  PolyGerrit: Remove support for drafts
  Discontinue draft workflow

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

@@ -54,11 +54,9 @@ limitations under the License.
 
     test('fix my menu item', () => {
       assert.deepEqual([
-        {url: '#/q/owner:self+is:draft'},
         {url: 'https://awesometown.com/#hashyhash'},
         {url: 'url', target: '_blank'},
       ].map(element._fixMyMenuItem), [
-        {url: '/q/owner:self+is:draft', external: true},
         {url: 'https://awesometown.com/#hashyhash', external: true},
         {url: 'url', external: true},
       ]);
@@ -66,12 +64,10 @@ limitations under the License.
 
     test('filter unsupported urls', () => {
       assert.deepEqual([
-        {url: '/q/owner:self+is:draft'},
         {url: '/c/331788/'},
         {url: '/groups/self'},
         {url: 'https://awesometown.com/#hashyhash'},
       ].filter(element._isSupportedLink), [
-        {url: '/q/owner:self+is:draft'},
         {url: '/c/331788/'},
         {url: 'https://awesometown.com/#hashyhash'},
       ]);

polygerrit-ui/app/elements/core/gr-search-bar/gr-search-bar.js

@@ -45,7 +45,6 @@
     'is:',
     'is:abandoned',
     'is:closed',
-    'is:draft',
     'is:ignored',
     'is:mergeable',
     'is:merged',
@@ -75,7 +74,6 @@
     'status:',
     'status:abandoned',
     'status:closed',
-    'status:draft',
     'status:merged',
     'status:open',
     'status:pending',