[WebXR] Fix MachSendRight build failures after 266327@main

https://bugs.webkit.org/show_bug.cgi?id=259585
rdar://113008655

Unreviewed build fix.

After 266327@main, MachSendRight() need to be moved instead of copied.

* Source/WebCore/Modules/webxr/WebXROpaqueFramebuffer.cpp:
(WebCore::WebXROpaqueFramebuffer::startFrame):
* Source/WebCore/platform/xr/PlatformXR.h:
(PlatformXR::Device::FrameData::LayerData::encode const):

Canonical link: https://commits.webkit.org/266375@main

Source/WebCore/Modules/webxr/WebXROpaqueFramebuffer.cpp

@@ -154,7 +154,7 @@ void WebXROpaqueFramebuffer::startFrame(const PlatformXR::Device::FrameData::Lay
 #if USE(IOSURFACE_FOR_XR_LAYER_DATA)
     // FIXME: This is temporary until Cocoa-specific platforms migrate to MTLTEXTURE_FOR_XR_LAYER_DATA.
     auto colorTextureSource = makeEGLImageSource({ data.surface->createSendRight(), false });
-    auto depthStencilBufferSource = makeEGLImageSource({ { }, false });
+    auto depthStencilBufferSource = makeEGLImageSource({ MachSendRight(), false });
 #elif USE(MTLTEXTURE_FOR_XR_LAYER_DATA)
     auto colorTextureSource = makeEGLImageSource(data.colorTexture);
     auto depthStencilBufferSource = makeEGLImageSource(data.depthStencilBuffer);

Source/WebCore/platform/xr/PlatformXR.h

@@ -582,7 +582,7 @@ void Device::FrameData::LayerData::encode(Encoder& encoder) const
 {
 #if USE(IOSURFACE_FOR_XR_LAYER_DATA)
     MachSendRight surfaceSendRight = surface ? surface->createSendRight() : MachSendRight();
-    encoder << surfaceSendRight;
+    encoder << WTFMove(surfaceSendRight);
     encoder << isShared;
 #elif USE(MTLTEXTURE_FOR_XR_LAYER_DATA)
     encoder << std::make_tuple(MachSendRight(std::get<0>(colorTexture)), std::get<1>(colorTexture));