[video_player_web] Make Map take 100% width/height of the PlatformView.

Author: ditman

packages/video_player/video_player_web/lib/video_player_web.dart

@@ -181,7 +181,9 @@ class _VideoPlayer {
       ..src = uri
       ..autoplay = false
       ..controls = false
-      ..style.border = 'none';
+      ..style.border = 'none'
+      ..style.height = '100%'
+      ..style.width = '100%';
 
     // Allows Safari iOS to play the video inline
     videoElement.setAttribute('playsinline', 'true');