Remove stale CGDisplayList flipping code

https://bugs.webkit.org/show_bug.cgi?id=259579
rdar://113001069

Reviewed by Wenson Hsieh.

* Source/WebKit/Shared/RemoteLayerTree/CGDisplayListImageBufferBackend.mm:
(WebKit::GraphicsContextCGDisplayList::GraphicsContextCGDisplayList):
* Source/WebKit/Shared/RemoteLayerTree/RemoteLayerBackingStore.mm:
(WebKit::RemoteLayerBackingStore::paintContents):

Canonical link: https://commits.webkit.org/266370@main

Source/WebKit/Shared/RemoteLayerTree/CGDisplayListImageBufferBackend.mm

@@ -60,10 +60,6 @@ static CFDictionaryRef makeContextOptions(const CGDisplayListImageBufferBackend:
     GraphicsContextCGDisplayList(const CGDisplayListImageBufferBackend::Parameters& parameters, WebCore::RenderingMode renderingMode)
         : GraphicsContextCG(adoptCF(WKCGCommandsContextCreate(parameters.logicalSize, makeContextOptions(parameters))).autorelease(), GraphicsContextCG::Unknown, renderingMode)
     {
-#if !HAVE(CG_DISPLAY_LIST_RESPECTING_CONTENTS_FLIPPED)
-        m_immutableBaseTransform.scale(1, -1);
-        m_immutableBaseTransform.translate(0, -ceilf(parameters.logicalSize.height() * parameters.resolutionScale));
-#endif
         m_immutableBaseTransform.scale(parameters.resolutionScale);
         m_inverseImmutableBaseTransform = *m_immutableBaseTransform.inverse();
         m_resolutionScale = parameters.resolutionScale;

Source/WebKit/Shared/RemoteLayerTree/RemoteLayerBackingStore.mm

@@ -566,10 +566,8 @@ static bool hasValue(const ImageBufferBackendHandle& backendHandle)
 
         BifurcatedGraphicsContext context(m_frontBuffer.imageBuffer->context(), displayListContext);
         drawInContext(context, [&] {
-#if HAVE(CG_DISPLAY_LIST_RESPECTING_CONTENTS_FLIPPED)
             displayListContext.scale(FloatSize(1, -1));
             displayListContext.translate(0, -m_parameters.size.height());
-#endif
         });
         return;
     }