Remove unused DOM Distiller feedback form.

Change-Id: I67a6aed61625f45968dd717e25e563ce86aa22c1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809504
Auto-Submit: Aran Gilman <gilmanmh@google.com>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697352}

components/dom_distiller/core/html/dom_distiller_viewer.html

@@ -35,15 +35,5 @@ found in the LICENSE file.
     </div>
     <a data-original-url="$7" id="closeReaderView">$8</a>
   </div>
-  <div id="feedbackContainer" class="footerFeedback hidden">
-    <div class="feedbackContent">
-      <div id="feedbackQuestion"></div>
-      <div class="feedbackButtonWrap">
-        <a class="feedbackButton" id="feedbackNo"></a>
-        <a class="feedbackButton" id="feedbackYes"></a>
-      </div>
-    </div>
-    <div class="clear"></div>
-  </div>
 </body>
 </html>