Begin removing deprecated (and now, unused) ImageFilter code paths

This CL focuses on removing the Proxy objects but takes some other stuff with it.

BUG=skia:4965
TBR=reed@google.com

GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1896383003

Review URL: https://codereview.chromium.org/1896383003
diff --git a/src/effects/SkLightingImageFilter.cpp b/src/effects/SkLightingImageFilter.cpp
index b37fc28..7f0e3ea 100644
--- a/src/effects/SkLightingImageFilter.cpp
+++ b/src/effects/SkLightingImageFilter.cpp
@@ -460,8 +460,7 @@
     this->drawRect(drawContext.get(), inputTexture.get(), matrix, clip, bottomRight,
                    kBottomRight_BoundaryMode, pSrcBounds, offsetBounds);
 
-    return SkSpecialImage::MakeFromGpu(source->internal_getProxy(),
-                                       SkIRect::MakeWH(offsetBounds.width(), offsetBounds.height()),
+    return SkSpecialImage::MakeFromGpu(SkIRect::MakeWH(offsetBounds.width(), offsetBounds.height()),
                                        kNeedNewImageUniqueID_SpecialImage,
                                        dst.get());
 }
@@ -1326,8 +1325,7 @@
             break;
     }
 
-    return SkSpecialImage::MakeFromRaster(source->internal_getProxy(),
-                                          SkIRect::MakeWH(bounds.width(), bounds.height()),
+    return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(bounds.width(), bounds.height()),
                                           dst);
 }
 
@@ -1493,9 +1491,7 @@
             break;
     }
 
-    return SkSpecialImage::MakeFromRaster(source->internal_getProxy(),
-                                          SkIRect::MakeWH(bounds.width(), bounds.height()),
-                                          dst);
+    return SkSpecialImage::MakeFromRaster(SkIRect::MakeWH(bounds.width(), bounds.height()), dst);
 }
 
 #ifndef SK_IGNORE_TO_STRING