Remove testing of Skia's defunct mask-filter occlusion rect feature

Skia's mask-filter occlusion rect feature has been defunct since the Skia CL:

https://skia-review.googlesource.com/c/skia/+/147561 (Remove occluder feature from blur mask filter)

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Iaa5656f0ff9e4b99500389651789f549f4352846
Reviewed-on: https://chromium-review.googlesource.com/1183623Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Robert Phillips <robertphillips@google.com>
Cr-Commit-Position: refs/heads/master@{#585005}

cc/paint/paint_op_buffer_unittest.cc

@@ -1072,7 +1072,7 @@ std::vector<PaintFlags> test_flags = {
       SkScalar intervals[] = {1.f, 1.f};
       flags.setPathEffect(SkDashPathEffect::Make(intervals, 2, 0));
       flags.setMaskFilter(SkMaskFilter::MakeBlur(
-          SkBlurStyle::kOuter_SkBlurStyle, 4.3f, test_rects[0]));
+          SkBlurStyle::kOuter_SkBlurStyle, 4.3f));
       flags.setColorFilter(SkColorMatrixFilter::MakeLightingFilter(
           SK_ColorYELLOW, SK_ColorGREEN));
 

cc/paint/paint_op_perftest.cc

@@ -129,7 +129,7 @@ TEST_F(PaintOpPerfTest, ManyFlagsOps) {
   SkScalar intervals[] = {1.f, 1.f};
   flags.setPathEffect(SkDashPathEffect::Make(intervals, 2, 0));
   flags.setMaskFilter(SkMaskFilter::MakeBlur(
-      SkBlurStyle::kOuter_SkBlurStyle, 4.3f, SkRect::MakeXYWH(1, 1, 1, 1)));
+      SkBlurStyle::kOuter_SkBlurStyle, 4.3));
   flags.setColorFilter(
       SkColorMatrixFilter::MakeLightingFilter(SK_ColorYELLOW, SK_ColorGREEN));