Remove two more gpu headers from include/*

This is probably it until GrTexture.h can be hidden.

TBR=bsalomon@google.com

Change-Id: Ie743c937f72aa0dc9f5e84def572f655f0abe041
Reviewed-on: https://skia-review.googlesource.com/14143
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>

gn/gpu.gni

@@ -21,7 +21,6 @@ skia_gpu_sources = [
   "$_include/gpu/GrRenderTarget.h",
   "$_include/gpu/GrResourceKey.h",
   "$_include/gpu/GrShaderCaps.h",
-  "$_include/gpu/GrShaderVar.h",
   "$_include/gpu/GrSurface.h",
   "$_include/gpu/GrTexture.h",
   "$_include/gpu/GrSamplerParams.h",
@@ -46,7 +45,6 @@ skia_gpu_sources = [
   "$_include/private/GrSurfaceProxy.h",
   "$_include/private/GrSwizzle.h",
   "$_include/private/GrTextureProxy.h",
-  "$_include/private/GrTextureRenderTargetProxy.h",
 
   "$_src/gpu/GrAppliedClip.h",
   "$_src/gpu/GrAuditTrail.cpp",
@@ -190,6 +188,7 @@ skia_gpu_sources = [
   "$_src/gpu/GrTestUtils.cpp",
   "$_src/gpu/GrTestUtils.h",
   "$_src/gpu/GrShaderVar.cpp",
+  "$_src/gpu/GrShaderVar.h",
   "$_src/gpu/GrSWMaskHelper.cpp",
   "$_src/gpu/GrSWMaskHelper.h",
   "$_src/gpu/GrSoftwarePathRenderer.cpp",
@@ -211,6 +210,7 @@ skia_gpu_sources = [
   "$_src/gpu/GrTextureProducer.h",
   "$_src/gpu/GrTextureProxy.cpp",
   "$_src/gpu/GrTextureRenderTargetProxy.cpp",
+  "$_src/gpu/GrTextureRenderTargetProxy.h",
   "$_src/gpu/GrTextureStripAtlas.h",
   "$_src/gpu/GrTextureToYUVPlanes.cpp",
   "$_src/gpu/GrTextureToYUVPlanes.h",

include/gpu/GrCaps.h

@@ -11,7 +11,6 @@
 #include "GrTypes.h"
 #include "GrTypesPriv.h"
 #include "GrBlend.h"
-#include "GrShaderVar.h"
 #include "GrShaderCaps.h"
 #include "SkRefCnt.h"
 #include "SkString.h"