Center align check duration and remove extra column.

Change-Id: I38ae7fdab6294128a65de9203a6dfca9fd115899
diff --git a/gr-checks/gr-checks-item.html b/gr-checks/gr-checks-item.html
index 096408c..cf569f8 100644
--- a/gr-checks/gr-checks-item.html
+++ b/gr-checks/gr-checks-item.html
@@ -21,6 +21,9 @@
       .nav-icon {
         cursor: pointer;
       }
+      .duration {
+        text-align: center;
+      }
     </style>
     <td>
       <template is="dom-if" if="[[check.message]]">
@@ -34,7 +37,6 @@
     <td>
       <gr-checks-status show-text status="[[check.state]]" downgrade-failure-to-warning="[[false]]"></gr-checks-status>
     </td>
-    <td><!--Check System--></td>
     <td>
       <gr-date-formatter
         has-tooltip
@@ -42,7 +44,7 @@
         date-str="[[_startTime]]">
       </gr-date-formatter>
     </td>
-    <td>[[_duration]]</td>
+    <td class="duration">[[_duration]]</td>
     <td>
       <a href$="[[check.url]]" target="_blank" class="log">
         <gr-button link no-uppercase disabled="[[!check.url]]">
diff --git a/gr-checks/gr-checks-item_test.html b/gr-checks/gr-checks-item_test.html
index fc12bba..4d479bb 100644
--- a/gr-checks/gr-checks-item_test.html
+++ b/gr-checks/gr-checks-item_test.html
@@ -47,14 +47,13 @@
       assert.exists(status);
     });
 
-    test('renders the run time', () => {
-      const name = element.$$('td:nth-child(6)');
-      assert.equal(name .textContent.trim(), '11:25:19 PM');
+    test('renders the start time', () => {
+      assert.equal(element._startTime, '2019-02-06T22:25:19.269Z');
     });
 
     suite('duration', () => {
       test('renders the run duration', () => {
-        const name = element.$$('td:nth-child(7)');
+        const name = element.$$('td:nth-child(6)');
         assert.equal(name .textContent.trim(), '25 sec');
       });
 
@@ -65,13 +64,13 @@
           started: '2019-02-06T22:25:19.269Z',
           finished: '2019-02-06T22:25:19.269Z',
         };
-        const name = element.$$('td:nth-child(7)');
+        const name = element.$$('td:nth-child(6)');
         assert.equal(name .textContent.trim(), '0 sec');
       });
     });
 
     test('renders a link to the log', () => {
-      const logLink = element.$$('td:nth-child(8) > a');
+      const logLink = element.$$('td:nth-child(7) > a');
       assert.equal(logLink.getAttribute('href'),
           'http://example.com/test-log-url');
       assert.equal(logLink.textContent.trim(), 'View log');
diff --git a/gr-checks/gr-checks-view.html b/gr-checks/gr-checks-view.html
index 9e0910d..d13ad14 100644
--- a/gr-checks/gr-checks-view.html
+++ b/gr-checks/gr-checks-view.html
@@ -163,7 +163,6 @@
             <th class="topHeader">Name</th>
             <th class="topHeader">For submit</th>
             <th class="topHeader">Status</th>
-            <th class="topHeader"><!--Checking system--></th>
             <th class="topHeader">Started</th>
             <th class="topHeader">Duration</th>
             <th class="topHeader"><!-- actions --></th>