Files.app: Update toolbar layout and icons on it.

ui/file_manager/file_manager/foreground/js/ui/file_manager_ui.js

Index: ui/file_manager/file_manager/foreground/js/ui/file_manager_ui.js
diff --git a/ui/file_manager/file_manager/foreground/js/ui/file_manager_ui.js b/ui/file_manager/file_manager/foreground/js/ui/file_manager_ui.js
index 7523a6e54de89f8a9b95b82e3b2d4fd28daf98e6..03e4fbd27d3d5af4e28a1624dabf42e44cdc3463 100644
--- a/ui/file_manager/file_manager/foreground/js/ui/file_manager_ui.js
+++ b/ui/file_manager/file_manager/foreground/js/ui/file_manager_ui.js
@@ -369,21 +369,8 @@ FileManagerUI.prototype.relayout = function() {
 FileManagerUI.prototype.setCurrentListType = function(listType) {
   this.listContainer.setCurrentListType(listType);
 
-  var iconElement = queryRequiredElement(this.toggleViewButton, 'core-icon');
-  switch (listType) {
-    case ListContainer.ListType.DETAIL:
-      iconElement.icon = 'view-module';
-      break;
-
-    case ListContainer.ListType.THUMBNAIL:
-      iconElement.icon = 'view-list';
-      break;
-
-    default:
-      assertNotReached();
-      break;
-  }
-
+  this.toggleViewButton.classList.toggle(
+      'thumbnail', listType === ListContainer.ListType.DETAIL);
   this.relayout();
 };