Rename `Element` => `LayoutElement` in LayoutPane

`Element` clashes with the TypeScript built-in and the bridge generation
gets confused now we have code to tell it that `Element` is a built-in
type.

I will work on a CL that errors when generating these bridges so that
this is spotted.

Change-Id: Ie6cb79bed29803728277233b4eb7ea53a8ff7af8
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2362568
Commit-Queue: Jack Franklin <[email protected]>
Reviewed-by: Alex Rudenko <[email protected]>
Auto-Submit: Jack Franklin <[email protected]>
diff --git a/front_end/elements/LayoutSidebarPane.js b/front_end/elements/LayoutSidebarPane.js
index 49d7085..24bc115 100644
--- a/front_end/elements/LayoutSidebarPane.js
+++ b/front_end/elements/LayoutSidebarPane.js
@@ -10,11 +10,11 @@
 import * as UI from '../ui/ui.js';
 
 import {ElementsPanel} from './ElementsPanel.js';
-import {createLayoutPane, Element} from './LayoutPane_bridge.js';  // eslint-disable-line no-unused-vars
+import {createLayoutPane, LayoutElement} from './LayoutPane_bridge.js';  // eslint-disable-line no-unused-vars
 
 /**
  * @param {!Array<!SDK.DOMModel.DOMNode>} nodes
- * @return {!Array<!Element>}
+ * @return {!Array<!LayoutElement>}
  */
 const gridNodesToElements = nodes => {
   return nodes.map(node => {