DevTools: simplify http handler delegate as it is moving into content.

chrome/browser/devtools/frontend/devtools_discovery_page.html

Index: chrome/browser/devtools/frontend/devtools_discovery_page.html
diff --git a/chrome/browser/devtools/frontend/devtools_discovery_page.html b/chrome/browser/devtools/frontend/devtools_discovery_page.html
index cf93966c72eec8a1355cdc82b2dcaeb8e2e2ab86..d6d9fb01ce793c36d1c340f1adc5139924a9c84b 100644
--- a/chrome/browser/devtools/frontend/devtools_discovery_page.html
+++ b/chrome/browser/devtools/frontend/devtools_discovery_page.html
@@ -35,26 +35,12 @@ body {
   -webkit-transition-delay: 0ms, 0ms;
 }
 
-.thumbnail {
-  background-attachment: scroll;
-  background-origin: padding-box;
-  background-repeat: no-repeat;
-  border: 1px solid rgba(184, 184, 184, 1);
-  flex: none;
-  height: 132px;
-  width: 212px;
-}
-
 .item:not(.connected):hover {
   background-color: rgba(242, 242, 242, 1);
   border-color: rgba(110, 116, 128, 1);
   color: black;
 }
 
-.item.connected .thumbnail {
-  opacity: 0.5;
-}
-
 .item.connected:hover {
   border-color: rgba(184, 184, 184, 1);
   color: rgb(110, 116, 128);
@@ -123,12 +109,6 @@ function appendItem(item_object) {
   }
   item_element.classList.add('item');
 
-  var thumbnail = document.createElement('div');
-  thumbnail.className = 'thumbnail';
-  thumbnail.style.cssText = 'background-image:url(' +
-      item_object.thumbnailUrl + ')';
-  item_element.appendChild(thumbnail);
-
   var description = document.createElement('div');
   description.className = 'description';