DevTools: migrate ResourcesPanel icons over to UI.Icon

third_party/WebKit/Source/devtools/front_end/ui/treeoutline.js

Index: third_party/WebKit/Source/devtools/front_end/ui/treeoutline.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/treeoutline.js b/third_party/WebKit/Source/devtools/front_end/ui/treeoutline.js
index b32588bfc35d12c21b9acd67704fa02f180d61d7..825e66bc8a6a3ea9396ec983fe3bdf669c98df9f 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/treeoutline.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/treeoutline.js
@@ -611,8 +611,6 @@ UI.TreeElement = class {
     }
 
     this._listItemNode.removeChildren();
-    if (this._iconElement)
-      this._listItemNode.appendChild(this._iconElement);
     if (this._leadingIconsElement)
       this._listItemNode.appendChild(this._leadingIconsElement);
     this._listItemNode.appendChild(this._titleElement);
@@ -640,14 +638,6 @@ UI.TreeElement = class {
     this.treeOutline._shadowRoot.getSelection().setBaseAndExtent(this._titleElement, 0, this._titleElement, 1);
   }
 
-  createIcon() {
-    if (!this._iconElement) {
-      this._iconElement = createElementWithClass('div', 'icon');
-      this._listItemNode.insertBefore(this._iconElement, this._listItemNode.firstChild);
-      this._ensureSelection();
-    }
-  }
-
   /**
    * @param {!Array<!UI.Icon>} icons
    */