Don't return early from report_pending_exception() if the value is an unexpected object.

We will now dispatch the error event in this case as well.

tests/wpt/metadata/XMLHttpRequest/send-usp.worker.js.ini

@@ -1,3 +1,3 @@
 [send-usp.worker.html]
   type: testharness
-  disabled: https://github.com/servo/servo/issues/12654
+  disabled: https://github.com/servo/servo/issues/12654

tests/wpt/metadata/dom/events/AddEventListenerOptions-passive.html.ini

@@ -1,6 +1,7 @@
 [AddEventListenerOptions-passive.html]
   type: testharness
   bug: https://github.com/servo/servo/issues/13243
+  expected: ERROR
   [Supports passive option on addEventListener only]
     expected: FAIL
 

tests/wpt/metadata/fetch/api/headers/headers-idl.html.ini

@@ -1,3 +1,3 @@
 [headers-idl.html]
   type: testharness
-  expected: TIMEOUT
+  expected: ERROR

tests/wpt/metadata/fetch/api/request/request-idl.html.ini

@@ -1,3 +1,3 @@
 [request-idl.html]
   type: testharness
-  expected: TIMEOUT
+  expected: ERROR

tests/wpt/metadata/fetch/api/response/response-idl.html.ini

@@ -1,3 +1,3 @@
 [response-idl.html]
   type: testharness
-  expected: TIMEOUT
+  expected: ERROR

tests/wpt/metadata/html/browsers/history/the-history-interface/004.html.ini

@@ -8,3 +8,4 @@
 
   [history position should be calculated when executing, not when calling the .go command]
     expected: FAIL
+

tests/wpt/metadata/html/browsers/sandboxing/sandbox-allow-scripts.html.ini

@@ -1,6 +1,6 @@
 [sandbox-allow-scripts.html]
   type: testharness
-  expected: TIMEOUT
+  expected: ERROR
   [Running script from sandbox='allow-scripts' iframe is allowed]
     expected: NOTRUN
 

tests/wpt/mozilla/meta/css/matchMedia.html.ini

@@ -8,3 +8,4 @@
 
   [Resize iframe from 200x100 to 200x50, then to 100x50]
     expected: FAIL
+

tests/wpt/mozilla/meta/mozilla/bluetooth/startNotifications/disconnect-called-during.html.ini

@@ -2,3 +2,4 @@
   type: testharness
   [disconnect() called during startNotifications. Reject with NetworkError.]
     expected: FAIL
+

tests/wpt/mozilla/meta/mozilla/bluetooth/stopNotifications/disconnect-called-during.html.ini

@@ -2,3 +2,4 @@
   type: testharness
   [disconnect() called during stopNotifications. Reject with NetworkError.]
     expected: FAIL
+

tests/wpt/mozilla/meta/mozilla/htmllabel-activation.html.ini

@@ -0,0 +1,6 @@
+[htmllabel-activation.html]
+  type: testharness
+
+  [If label's 1st child (submit) is disabled, click should have no impact]
+    expected: FAIL
+

tests/wpt/mozilla/tests/mozilla/htmllabel-activation.html

@@ -37,7 +37,7 @@
         label.click();
         assert_false(disabledcb.checked, "checkbox should not be checked")
         assert_false(checkbox.checked, "checkbox should not be checked")
-    }, "If label's 1st child is disabled, click should have no impact");
+    }, "If label's 1st child (checkbox) is disabled, click should have no impact");
 
     test(function() {
         document.querySelector("#test").innerHTML = '<label id="label">hi \
@@ -81,7 +81,7 @@
         label.click();
         assert_false(disabledRadio.checked, "disabled radio should not be checked")
         assert_false(checkbox.checked, "checkbox should not be checked")
-    }, "If label's 1st child is disabled, click should have no impact");
+    }, "If label's 1st child (radio) is disabled, click should have no impact");
 
 
     test(function() {
@@ -110,13 +110,13 @@
             disabledSubmit = document.getElementById('disabledSubmit'),
             checkbox = document.getElementById('checkbox');
 
-        disabledSubmit.onclick = function() {
+        disabledSubmit.onclick = this.step_func(function() {
             assert_unreached("disabled submit should not have been activated")
-        };
+        });
 
         label.click();
         assert_false(checkbox.checked, "checkbox should not be checked")
-    }, "If label's 1st child is disabled, click should have no impact");
+    }, "If label's 1st child (submit) is disabled, click should have no impact");
 
     test(function() {
         document.querySelector("#test").innerHTML = '<label id="label" for="checkbox2">hi \