fix: use OOPIF for webview tag (#13869)

* fix: use OOIF for webview tag

* fix: do not call GetNativeView for webview

* fix: OOIPF webview's WebContents is managed by embedder frame

* fix: guest view can not be focused

* fix: clear zoom controller when guest is destroyed

* fix: implement the webview resize event

The webview is no longer a browser plugin with the resize event, use
ResizeObserver instead.

* test: disable failed tests due to OOPIF webview

* fix: embedder can be destroyed earlier than guest

This happens when embedder is manually destroyed.

* fix: don't double attach

* fix: recreate iframe when webview is reattached

* fix: resize event may happen very early

* test: some tests are working after OOPIF webview

* chore: remove unused browser plugin webview code

* fix: get embedder via closure

When the "destroyed" event is emitted, the entry in guestInstances would be
cleared.

* chore: rename browserPluginNode to internalElement

* test: make the visibilityState test more robust

* chore: guestinstance can not work with OOPIF webview

* fix: element could be detached before got response from browser

atom/renderer/renderer_client_base.h

@@ -46,10 +46,6 @@ class RendererClientBase : public content::ContentRendererClient {
   bool OverrideCreatePlugin(content::RenderFrame* render_frame,
                             const blink::WebPluginParams& params,
                             blink::WebPlugin** plugin) override;
-  content::BrowserPluginDelegate* CreateBrowserPluginDelegate(
-      content::RenderFrame* render_frame,
-      const std::string& mime_type,
-      const GURL& original_url) override;
   void AddSupportedKeySystems(
       std::vector<std::unique_ptr<::media::KeySystemProperties>>* key_systems)
       override;