Revert "turned on for macos ios only"

This reverts commit 3d8682e.

Author: gaaclarke

impeller/entity/contents/filters/filter_contents.cc

@@ -50,54 +50,18 @@ std::shared_ptr<FilterContents> FilterContents::MakeDirectionalGaussianBlur(
   return blur;
 }
 
-#if defined(FML_OS_MACOSX) || defined(FML_OS_IOS)
-#define IMPELLER_ENABLE_NEW_GAUSSIAN_FILTER 1
-#endif
-
-#ifdef IMPELLER_ENABLE_NEW_GAUSSIAN_FILTER
 const int32_t FilterContents::kBlurFilterRequiredMipCount = 4;
-#else
-const int32_t FilterContents::kBlurFilterRequiredMipCount = 1;
-#endif
 
 std::shared_ptr<FilterContents> FilterContents::MakeGaussianBlur(
     const FilterInput::Ref& input,
     Sigma sigma_x,
     Sigma sigma_y,
     BlurStyle blur_style,
     Entity::TileMode tile_mode) {
-  constexpr bool use_new_filter =
-#ifdef IMPELLER_ENABLE_NEW_GAUSSIAN_FILTER
-      true;
-#else
-      false;
-#endif
-
-  // TODO(https://github.com/flutter/flutter/issues/131580): Remove once the new
-  // blur handles all cases.
-  if (use_new_filter) {
-    auto blur = std::make_shared<GaussianBlurFilterContents>(
-        sigma_x.sigma, sigma_y.sigma, tile_mode);
-    blur->SetInputs({input});
-    return blur;
-  }
-  std::shared_ptr<FilterContents> x_blur = MakeDirectionalGaussianBlur(
-      /*input=*/input,
-      /*sigma=*/sigma_x,
-      /*direction=*/Point(1, 0),
-      /*blur_style=*/BlurStyle::kNormal,
-      /*tile_mode=*/tile_mode,
-      /*is_second_pass=*/false,
-      /*secondary_sigma=*/{});
-  std::shared_ptr<FilterContents> y_blur = MakeDirectionalGaussianBlur(
-      /*input=*/FilterInput::Make(x_blur),
-      /*sigma=*/sigma_y,
-      /*direction=*/Point(0, 1),
-      /*blur_style=*/blur_style,
-      /*tile_mode=*/tile_mode,
-      /*is_second_pass=*/true,
-      /*secondary_sigma=*/sigma_x);
-  return y_blur;
+  auto blur = std::make_shared<GaussianBlurFilterContents>(
+      sigma_x.sigma, sigma_y.sigma, tile_mode);
+  blur->SetInputs({input});
+  return blur;
 }
 
 std::shared_ptr<FilterContents> FilterContents::MakeBorderMaskBlur(