[Mac] Content briefly zooms in when exiting PIP

https://bugs.webkit.org/show_bug.cgi?id=255892
rdar://107835087

Reviewed by Eric Carlson.

When we changed VideoFullscreenInterfaceMac to use WebAVPlayerLayer, it meant that explicitly
resizing the layer on PiP exit was no longer necessary; that's handled by WebAVPlayerLayer itself.

* Source/WebCore/platform/mac/VideoFullscreenInterfaceMac.mm:
(-[WebVideoFullscreenInterfaceMacObjC pipDidClose:]):

Canonical link: https://commits.webkit.org/263350@main

Source/WebCore/platform/mac/VideoFullscreenInterfaceMac.mm

@@ -333,9 +333,6 @@ - (void)pipDidClose:(PIPViewController *)pip
         [NSAnimationContext runAnimationGroup:^(NSAnimationContext *context) {
             context.allowsImplicitAnimation = NO;
             [_videoViewContainer setFrame:_returningRect];
-            _videoFullscreenInterfaceMac->videoFullscreenModel()->setVideoLayerFrame([_videoViewContainer bounds]);
-            _videoFullscreenInterfaceMac->videoFullscreenModel()->setVideoLayerGravity(MediaPlayerEnums::VideoGravity::ResizeAspect);
-
             [[_returningWindow contentView] addSubview:_videoViewContainer.get() positioned:NSWindowAbove relativeTo:nil];
         } completionHandler:nil];
     }