Bug 1894498 - Remove unused method gfxASurface::CopyToARGB32ImageSurface. r=gfx-reviewers,lsalzman

According to searchfox, there are no callers.

Differential Revision: https://phabricator.services.mozilla.com/D209142

gfx/thebes/gfxASurface.cpp

@@ -248,25 +248,6 @@ void gfxASurface::Finish() {
   cairo_surface_finish(mSurface);
 }
 
-already_AddRefed<gfxImageSurface> gfxASurface::CopyToARGB32ImageSurface() {
-  if (!mSurface || !mSurfaceValid) {
-    return nullptr;
-  }
-
-  const IntSize size = GetSize();
-  RefPtr<gfxImageSurface> imgSurface =
-      new gfxImageSurface(size, SurfaceFormat::A8R8G8B8_UINT32);
-
-  RefPtr<DrawTarget> dt = gfxPlatform::CreateDrawTargetForSurface(
-      imgSurface, IntSize(size.width, size.height));
-  RefPtr<SourceSurface> source =
-      gfxPlatform::GetSourceSurfaceForSurface(dt, this);
-
-  dt->CopySurface(source, IntRect(0, 0, size.width, size.height), IntPoint());
-
-  return imgSurface.forget();
-}
-
 int gfxASurface::CairoStatus() {
   if (!mSurfaceValid) return -1;
 

gfx/thebes/gfxASurface.h

@@ -80,12 +80,6 @@ class gfxASurface {
    */
   virtual already_AddRefed<gfxImageSurface> GetAsImageSurface();
 
-  /**
-   * Creates a new ARGB32 image surface with the same contents as this surface.
-   * Returns null on error.
-   */
-  already_AddRefed<gfxImageSurface> CopyToARGB32ImageSurface();
-
   int CairoStatus();
 
   static gfxContentType ContentFromFormat(gfxImageFormat format);