Remove workaround

Upstream bug is fixed now.

[email protected]

Review URL: https://codereview.chromium.org/1096353002

Author: vsmenon

pkg/dev_compiler/test/codegen/expect/sunflower/sunflower.txt

@@ -1,10 +1,10 @@
 // Messages from compiling sunflower.html
-info: line 21, column 29 of test/codegen/sunflower/sunflower.dart: [AssignmentCast] querySelector("#slider") (Element) will need runtime check to cast to type InputElement
+info: line 20, column 29 of test/codegen/sunflower/sunflower.dart: [AssignmentCast] querySelector("#slider") (Element) will need runtime check to cast to type InputElement
 final InputElement slider = querySelector("#slider");
                             ^^^^^^^^^^^^^^^^^^^^^^^^
-info: line 26, column 5 of test/codegen/sunflower/sunflower.dart: [AssignmentCast] (querySelector("#canvas") as CanvasElement).getContext('2d') (RenderingContext) will need runtime check to cast to type CanvasRenderingContext2D
+info: line 25, column 5 of test/codegen/sunflower/sunflower.dart: [AssignmentCast] (querySelector("#canvas") as CanvasElement).getContext('2d') (RenderingContext) will need runtime check to cast to type CanvasRenderingContext2D
     (querySelector("#canvas") as CanvasElement).getContext('2d');
     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
-info: line 29, column 37 of test/codegen/sunflower/sunflower.dart: [InferredTypeClosure] (e) => draw() has inferred type (Event) → void
+info: line 28, column 37 of test/codegen/sunflower/sunflower.dart: [InferredTypeClosure] (e) => draw() has inferred type (Event) → void
   slider.addEventListener('change', (e) => draw());
                                     ^^^^^^^^^^^^^

pkg/dev_compiler/test/codegen/sunflower/sunflower.dart

@@ -12,9 +12,8 @@ const SEED_RADIUS = 2;
 const SCALE_FACTOR = 4;
 const TAU = PI * 2;
 const MAX_D = 300;
-// TODO(sigmund): remove `num` here, this is to workaround dartbug.com/22937
-const num centerX = MAX_D / 2;
-const num centerY = centerX;
+const centerX = MAX_D / 2;
+const centerY = centerX;
 
 Element querySelector(String selector) => document.querySelector(selector);