Dispatch error events at the window object.

tests/wpt/metadata/html/semantics/forms/constraints/form-validation-checkValidity.html.ini

@@ -1,5 +1,6 @@
 [form-validation-checkValidity.html]
   type: testharness
+  expected: ERROR
   [[INPUT in TEXT status\] no constraint]
     expected: FAIL
 

tests/wpt/metadata/html/semantics/forms/constraints/form-validation-reportValidity.html.ini

@@ -1,5 +1,6 @@
 [form-validation-reportValidity.html]
   type: testharness
+  expected: ERROR
   [[INPUT in TEXT status\] no constraint]
     expected: FAIL
 

tests/wpt/metadata/html/semantics/forms/constraints/form-validation-validity-customError.html.ini

@@ -1,5 +1,6 @@
 [form-validation-validity-customError.html]
   type: testharness
+  expected: ERROR
   [[input\]  The validity.customError must be true if the custom validity error message is not empty]
     expected: FAIL
 

tests/wpt/metadata/html/semantics/forms/constraints/form-validation-validity-valid.html.ini

@@ -1,5 +1,6 @@
 [form-validation-validity-valid.html]
   type: testharness
+  expected: ERROR
   [[INPUT in TEXT status\] validity.valid must be false if validity.tooLong is true]
     expected: FAIL
 

tests/wpt/metadata/html/semantics/forms/constraints/form-validation-validity-valueMissing.html.ini

@@ -1,5 +1,6 @@
 [form-validation-validity-valueMissing.html]
   type: testharness
+  expected: ERROR
   [[INPUT in TEXT status\] The required attribute is not set]
     expected: FAIL
 

tests/wpt/metadata/html/semantics/forms/constraints/form-validation-willValidate.html.ini

@@ -1,5 +1,6 @@
 [form-validation-willValidate.html]
   type: testharness
+  expected: ERROR
   [[INPUT in HIDDEN status\] Must be barred from the constraint validation]
     expected: FAIL