Revert "Add user header to the dashboard view"

This reverts commit 50d6cb54e4.

Breaks the tests:

--- Errors --
Error from file: interface-test.js
initializing variable
found   : module$exports$polygerrit$polygerrit-ui$app$elements$change-list$gr-dashboard-view$gr-dashboard-view$js
required: polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.html
missing : []
mismatch: [params]

Change-Id: I8da6f0bcbac79dd32711b4aadf4aab116d7ffecb

polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.html

@@ -19,7 +19,6 @@ limitations under the License.
 <link rel="import" href="../../../styles/shared-styles.html">
 <link rel="import" href="../../change-list/gr-change-list/gr-change-list.html">
 <link rel="import" href="../../shared/gr-rest-api-interface/gr-rest-api-interface.html">
-<link rel="import" href="../gr-user-header/gr-user-header.html">
 
 <dom-module id="gr-dashboard-view">
   <template>
@@ -35,9 +34,6 @@ limitations under the License.
       gr-change-list {
         width: 100%;
       }
-      .hide {
-        display: none;
-      }
       @media only screen and (max-width: 50em) {
         .loading {
           padding: 0 var(--default-horizontal-margin);
@@ -46,9 +42,6 @@ limitations under the License.
     </style>
     <div class="loading" hidden$="[[!_loading]]">Loading...</div>
     <div hidden$="[[_loading]]" hidden>
-      <gr-user-header
-          user-id="[[params.user]]"
-          class$="[[_computeUserHeaderClass(params.user)]]"></gr-user-header>
       <gr-change-list
           show-star
           show-reviewed-state

polygerrit-ui/app/elements/change-list/gr-dashboard-view/gr-dashboard-view.js

@@ -144,8 +144,5 @@
       return query.replace(/\$\{user\}/g, user);
     },
 
-    _computeUserHeaderClass(userParam) {
-      return userParam === 'self' ? 'hide' : '';
-    },
   });
 })();