Remove color space restrictions from GrBackendTextureImageGenerator

This restriction should have only been enforced in linear-blending mode,
and even then, it's no longer true.

Fixes https://github.com/flutter/flutter/issues/14077

Bug: skia:
Change-Id: Ie0904475e29b213ad7995b8f39c02f6ea7396a9a
Reviewed-on: https://skia-review.googlesource.com/94782
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>

src/gpu/GrBackendTextureImageGenerator.cpp

@@ -33,10 +33,6 @@ std::unique_ptr<SkImageGenerator>
 GrBackendTextureImageGenerator::Make(sk_sp<GrTexture> texture, GrSurfaceOrigin origin,
                                      sk_sp<GrSemaphore> semaphore,
                                      SkAlphaType alphaType, sk_sp<SkColorSpace> colorSpace) {
-    if (colorSpace && (!colorSpace->gammaCloseToSRGB() && !colorSpace->gammaIsLinear())) {
-        return nullptr;
-    }
-
     SkColorType colorType = kUnknown_SkColorType;
     if (!GrPixelConfigToColorType(texture->config(), &colorType)) {
         return nullptr;