<webview>: Reuse GuestViewBase::HandleKeyboardEvent code.

extensions/browser/guest_view/web_view/web_view_guest.cc

Index: extensions/browser/guest_view/web_view/web_view_guest.cc
diff --git a/extensions/browser/guest_view/web_view/web_view_guest.cc b/extensions/browser/guest_view/web_view/web_view_guest.cc
index 7176e10185b83dcd75821dfd93743c0c330daa64..dc0a0e047e2810b1e14308ea2df21bdbf742545f 100644
--- a/extensions/browser/guest_view/web_view/web_view_guest.cc
+++ b/extensions/browser/guest_view/web_view/web_view_guest.cc
@@ -434,20 +434,10 @@ bool WebViewGuest::HandleContextMenu(
 void WebViewGuest::HandleKeyboardEvent(
     WebContents* source,
     const content::NativeWebKeyboardEvent& event) {
-  if (!attached())
-    return;
-
   if (HandleKeyboardShortcuts(event))
     return;
 
-  // Send the unhandled keyboard events back to the embedder to reprocess them.
-  // TODO(fsamuel): This introduces the possibility of out-of-order keyboard
-  // events because the guest may be arbitrarily delayed when responding to
-  // keyboard events. In that time, the embedder may have received and processed
-  // additional key events. This needs to be fixed as soon as possible.
-  // See http://crbug.com/229882.
-  embedder_web_contents()->GetDelegate()->HandleKeyboardEvent(
-      web_contents(), event);
+  GuestViewBase::HandleKeyboardEvent(source, event);
 }
 
 void WebViewGuest::LoadProgressChanged(content::WebContents* source,