Revert "Use ManagedBackendTexture in place of TestUtils backend texture helpers."

This reverts commit 5ee0556048a10d3bea818042094d92356d256b53.

Reason for revert: breaking bots

Original change's description:
> Use ManagedBackendTexture in place of TestUtils backend texture helpers.
>
> Unify on a single family of helpers for making backend textures.
>
> Stresses callback systems in more tests by avoiding artificial
> flush/submit/syncs.
>
> some misc test cleanup along the way.
>
> Change-Id: Ia692e8927ba97b391ee77ea06ebf437a555617b2
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/324710
> Commit-Queue: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Greg Daniel <egdaniel@google.com>

TBR=egdaniel@google.com,bsalomon@google.com

Change-Id: I7d4fc9412c870ae13f7498671379b871dbf5a6c4
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/325619
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/tools/gpu/BackendTextureImageFactory.h b/tools/gpu/BackendTextureImageFactory.h
index 289f268..3de31a5 100644
--- a/tools/gpu/BackendTextureImageFactory.h
+++ b/tools/gpu/BackendTextureImageFactory.h
@@ -5,15 +5,12 @@
  * found in the LICENSE file.
  */
 
-#include "include/core/SkColor.h"
 #include "include/core/SkRefCnt.h"
 #include "include/gpu/GrTypes.h"
 
 class GrDirectContext;
-class SkColorSpace;
 class SkImage;
 class SkPixmap;
-struct SkISize;
 
 namespace sk_gpu_test {
 /**
@@ -23,17 +20,6 @@
  * For testing purposes the texture can be made renderable to exercise different code paths for
  * renderable textures/formats.
  */
-sk_sp<SkImage> MakeBackendTextureImage(GrDirectContext*,
-                                       const SkPixmap&,
-                                       GrRenderable,
-                                       GrSurfaceOrigin);
-
-/** Creates an image of with a solid color. */
-sk_sp<SkImage> MakeBackendTextureImage(GrDirectContext*,
-                                       const SkImageInfo& info,
-                                       SkColor4f,
-                                       GrMipmapped = GrMipmapped::kNo,
-                                       GrRenderable = GrRenderable::kNo,
-                                       GrSurfaceOrigin = GrSurfaceOrigin::kTopLeft_GrSurfaceOrigin);
-
+sk_sp<SkImage> MakeBackendTextureImage(GrDirectContext*, const SkPixmap&,
+                                       GrRenderable, GrSurfaceOrigin);
 }  // namespace sk_gpu_test