Revert "Store GrSwizzle on proxies for texturing and swizzling."

This reverts commit 23093135d17427ef59385761d2d729ada6d961cf.

Reason for revert: Breaking Google3 :(

Original change's description:
> Store GrSwizzle on proxies for texturing and swizzling.
> 
> Bug: skia: 6718
> Change-Id: I023d7507da9334e984ac8209a32323d616b3d79d
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/214305
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Greg Daniel <egdaniel@google.com>

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

Change-Id: Ie2303ad090f58de07db7b0ac2d42e06e5e5bbcc1
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia: 6718
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/221338
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/glsl/GrGLSLShaderBuilder.cpp b/src/gpu/glsl/GrGLSLShaderBuilder.cpp
index 5a82058..bd30080 100644
--- a/src/gpu/glsl/GrGLSLShaderBuilder.cpp
+++ b/src/gpu/glsl/GrGLSLShaderBuilder.cpp
@@ -5,13 +5,12 @@
  * found in the LICENSE file.
  */
 
-#include "src/gpu/glsl/GrGLSLShaderBuilder.h"
-
-#include "include/private/GrSwizzle.h"
 #include "src/gpu/GrShaderCaps.h"
 #include "src/gpu/GrShaderVar.h"
+#include "src/gpu/GrSwizzle.h"
 #include "src/gpu/glsl/GrGLSLColorSpaceXformHelper.h"
 #include "src/gpu/glsl/GrGLSLProgramBuilder.h"
+#include "src/gpu/glsl/GrGLSLShaderBuilder.h"
 
 GrGLSLShaderBuilder::GrGLSLShaderBuilder(GrGLSLProgramBuilder* program)
     : fProgramBuilder(program)