[global] Remaps self.UI.viewManager

Moves self.UI.viewManager to an instance() method.

Bug: 1058320
Change-Id: I0c444101da59ba9eba4745d1dc551bb8906a0a4f
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2107624
Reviewed-by: Jack Franklin <[email protected]>
Commit-Queue: Paul Lewis <[email protected]>
diff --git a/front_end/resources/ResourcesPanel.js b/front_end/resources/ResourcesPanel.js
index 0a073cf..9c0f6b9 100644
--- a/front_end/resources/ResourcesPanel.js
+++ b/front_end/resources/ResourcesPanel.js
@@ -214,7 +214,7 @@
       return Promise.reject(new Error('Internal error: not a resource'));
     }
     const sidebar = ResourcesPanel._instance()._sidebar;
-    await self.UI.viewManager.showView('resources');
+    await UI.ViewManager.ViewManager.instance().showView('resources');
     await sidebar.showResource(resource);
   }
 }
@@ -234,7 +234,7 @@
     }
 
     const sidebar = ResourcesPanel._instance()._sidebar;
-    await self.UI.viewManager.showView('resources');
+    await UI.ViewManager.ViewManager.instance().showView('resources');
     await sidebar.cookieListTreeElement.select();
 
     const contextUrl = cookie.contextUrl();