mac: Remove code to support OS X 10.10 in //gpu

Bug: 1153883
Change-Id: I91cabcc04d78ad3d3d97bdb55855bedc9eb92114
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2571805Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833430}

gpu/command_buffer/service/shared_image_backing_factory_iosurface.mm

@@ -35,11 +35,11 @@ namespace gpu {
 
 namespace {
 
-base::scoped_nsprotocol<id<MTLTexture>> API_AVAILABLE(macos(10.11))
-    CreateMetalTexture(id<MTLDevice> mtl_device,
-                       IOSurfaceRef io_surface,
-                       const gfx::Size& size,
-                       viz::ResourceFormat format) {
+base::scoped_nsprotocol<id<MTLTexture>> CreateMetalTexture(
+    id<MTLDevice> mtl_device,
+    IOSurfaceRef io_surface,
+    const gfx::Size& size,
+    viz::ResourceFormat format) {
   TRACE_EVENT0("gpu", "SharedImageBackingFactoryIOSurface::CreateMetalTexture");
   base::scoped_nsprotocol<id<MTLTexture>> mtl_texture;
   MTLPixelFormat mtl_pixel_format =
@@ -175,26 +175,23 @@ SharedImageBackingFactoryIOSurface::ProduceSkiaPromiseTextureMetal(
     SharedImageBacking* backing,
     scoped_refptr<SharedContextState> context_state,
     scoped_refptr<gl::GLImage> image) {
-  if (@available(macOS 10.11, *)) {
-    DCHECK(context_state->GrContextIsMetal());
-
-    base::ScopedCFTypeRef<IOSurfaceRef> io_surface =
-        static_cast<gl::GLImageIOSurface*>(image.get())->io_surface();
-
-    id<MTLDevice> mtl_device =
-        context_state->metal_context_provider()->GetMTLDevice();
-    auto mtl_texture = CreateMetalTexture(mtl_device, io_surface.get(),
-                                          backing->size(), backing->format());
-    DCHECK(mtl_texture);
-
-    GrMtlTextureInfo info;
-    info.fTexture.retain(mtl_texture.get());
-    auto gr_backend_texture =
-        GrBackendTexture(backing->size().width(), backing->size().height(),
-                         GrMipMapped::kNo, info);
-    return SkPromiseImageTexture::Make(gr_backend_texture);
-  }
-  return nullptr;
+  DCHECK(context_state->GrContextIsMetal());
+
+  base::ScopedCFTypeRef<IOSurfaceRef> io_surface =
+      static_cast<gl::GLImageIOSurface*>(image.get())->io_surface();
+
+  id<MTLDevice> mtl_device =
+      context_state->metal_context_provider()->GetMTLDevice();
+  auto mtl_texture = CreateMetalTexture(mtl_device, io_surface.get(),
+                                        backing->size(), backing->format());
+  DCHECK(mtl_texture);
+
+  GrMtlTextureInfo info;
+  info.fTexture.retain(mtl_texture.get());
+  auto gr_backend_texture =
+      GrBackendTexture(backing->size().width(), backing->size().height(),
+                       GrMipMapped::kNo, info);
+  return SkPromiseImageTexture::Make(gr_backend_texture);
 }
 
 // static