Revert "Mark supportsPointConversions deprecated and always true rather than testing DOMPoint"

tests/html/html.status

Index: tests/html/html.status
diff --git a/tests/html/html.status b/tests/html/html.status
index c87a8a0adda86d2680ba732dff096f85eb26b373..ffe07231f22ed98641980e03de71711c43dda561 100644
--- a/tests/html/html.status
+++ b/tests/html/html.status
@@ -154,6 +154,7 @@ request_animation_frame_test: Skip # Times out. Issue 22167
 audiobuffersourcenode_test/supported: Fail
 audiocontext_test/supported: Fail
 crypto_test/supported: Fail
+css_test/supportsPointConversions: Fail
 document_test/supports_cssCanvasContext: Fail
 element_types_test/supported_content: Fail
 element_types_test/supported_details: Fail
@@ -196,6 +197,10 @@ transferables_test: Fail # Issue 9846
 [ $compiler == dart2js && $minified ]
 canvas_pixel_array_type_alias_test/types2_runtimeTypeName: Fail, OK # Issue 12605
 
+[ $compiler == dart2js && $runtime == chrome ]
+css_test/supportsPointConversions: Fail # Issues 21710
+css_test/functional: Fail # Issues 21710
+
 [ $runtime == ie11 ]
 custom/document_register_type_extensions_test/single-parameter: Fail # Issue 13193.
 canvasrenderingcontext2d_test/arc: Pass, Fail # Pixel unexpected value. Please triage this failure.
@@ -208,6 +213,7 @@ transferables_test: Pass, Fail # Issues 20659.
 audiobuffersourcenode_test/supported: Fail
 audiocontext_test/supported: Fail
 crypto_test/supported: Fail
+css_test/supportsPointConversions: Fail
 document_test/supports_cssCanvasContext: Fail
 element_types_test/supported_content: Fail
 element_types_test/supported_details: Fail
@@ -327,6 +333,7 @@ url_test: Fail
 audiobuffersourcenode_test/supported: Fail
 audiocontext_test/supported: Fail
 crypto_test/supported: Fail
+css_test/supportsPointConversions: Fail
 document_test/supports_cssCanvasContext: Fail
 element_types_test/supported_template: Fail
 indexeddb_1_test/supported: Fail