Revert the roll of co19.

tests/co19/co19-co19.status

Index: tests/co19/co19-co19.status
diff --git a/tests/co19/co19-co19.status b/tests/co19/co19-co19.status
index 22b3c272ae162e1d93bffc456830acdd7c4d8c73..f6e0f6d1876297544f77f70f487ac26c458349dc 100644
--- a/tests/co19/co19-co19.status
+++ b/tests/co19/co19-co19.status
@@ -14,10 +14,30 @@
 [ $runtime == vm || $runtime != vm ]
 # Tests that fail everywhere, including the analyzer.
 
+Language/Classes/Constructors/Constant_Constructors/initializer_not_a_constant_t01: Pass, Fail, OK # co19 issue 18
+Language/Classes/Constructors/Constant_Constructors/initializer_not_a_constant_t02: Pass, Fail, OK # co19 issue 18
+Language/Classes/Constructors/Constant_Constructors/initializer_not_a_constant_t03: Pass, Fail, OK # co19 issue 18
+Language/Classes/Constructors/Constant_Constructors/not_a_constant_in_superclass_t01: Pass, Fail, OK # co19 issue 18
+Language/Classes/Constructors/Constant_Constructors/not_a_constant_in_superclass_t02: Pass, Fail, OK # co19 issue 18
+
+# Super is now allowed in mixins and mixins may now extend a subclass of Object.
+Language/09_Mixins/09_Mixins_A01_t01: Skip # co19 issue 9.
+Language/09_Mixins/09_Mixins_A03_t01: Skip # co19 issue 9.
+
+# No longer correct, y#$ now has a meaning. github.com/dart-lang/co19/issues/2
+Language/12_Expressions/30_Identifier_Reference_A01_t03: Skip
+
 LibTest/typed_data/ByteData/buffer_A01_t01: Fail # co19 r736 bug - sent comment.
 
 LibTest/core/RegExp/firstMatch_A01_t01: Fail # co19 issue 742
 
+# These tests are obsolete and need updating.
+WebPlatformTest/shadow-dom/elements-and-dom-objects/shadowroot-object/shadowroot-attributes/test-002_t01: Skip # Issue 19019
+WebPlatformTest/shadow-dom/elements-and-dom-objects/shadowroot-object/shadowroot-attributes/test-003_t01: Skip # Issue 19019
+
+# These tests are broken in both Javascript and Dart (co19 folks contacted to fix).
+WebPlatformTest/shadow-dom/elements-and-dom-objects/shadowroot-object/shadowroot-methods/test-004_t01: Skip # Issue 21115
+
 [ $compiler != dart2analyzer ]
 # Tests that fail on every runtime, but not on the analyzer.
 
@@ -32,12 +52,12 @@ Language/Classes/same_name_type_variable_t01: Pass, MissingCompileTimeError, Fai
 Language/Classes/same_name_type_variable_t04: Pass, MissingCompileTimeError, Fail # Issue 14513
 Language/Classes/same_name_type_variable_t07: Pass, MissingCompileTimeError, Fail # Issue 14513
 
-LibTest/math/acos_A01_t01: PASS, FAIL, OK  # Issue 26261 
-LibTest/math/asin_A01_t01: PASS, FAIL, OK  # Issue 26261 
-LibTest/math/atan_A01_t01: PASS, FAIL, OK  # Issue 26261 
+LibTest/math/acos_A01_t01: PASS, FAIL, OK # co19 issue 44
+LibTest/math/asin_A01_t01: PASS, FAIL, OK # co19 issue 44
+LibTest/math/atan_A01_t01: PASS, FAIL, OK # co19 issue 44
 
-LibTest/math/cos_A01_t01: PASS, FAIL, OK  # Issue 26261 
-LibTest/math/tan_A01_t01: PASS, FAIL, OK  # Issue 26261 
+LibTest/math/cos_A01_t01: PASS, FAIL, OK # co19 issue 44
+LibTest/math/tan_A01_t01: PASS, FAIL, OK # co19 issue 44
 
 LibTest/core/Expando/Expando_A03_t01: RuntimeError # Issue 17735
 LibTest/core/Expando/Expando_A03_t03: RuntimeError # Issue 17735
@@ -80,4 +100,6 @@ LibTest/async/Future/Future.delayed_A01_t02: Pass, Fail # Issue 15524
 ### CHECKED MODE FAILURES ###
 
 [ $compiler != dart2analyzer && $checked ]
-Language/Statements/Return/runtime_type_t04: RuntimeError # Issue 26133
+LibTest/collection/DoubleLinkedQueue/removeFirst_A01_t01: RuntimeError # co19 issue 22
+LibTest/collection/LinkedList/LinkedList_A01_t01: RuntimeError # co19 issue 23
+LibTest/collection/LinkedList/lastWhere_A02_t01: RuntimeError # co19 issue 737