Revert changes to event signatures as they broke one co19 test and this change isn't required due t…

tools/dom/scripts/htmleventgenerator.py

Index: tools/dom/scripts/htmleventgenerator.py
diff --git a/tools/dom/scripts/htmleventgenerator.py b/tools/dom/scripts/htmleventgenerator.py
index b7cb25e854956cc78548b82053b872a449336a32..9c1928a57652a4efdc4280b7bc53acdf075f8dc8 100644
--- a/tools/dom/scripts/htmleventgenerator.py
+++ b/tools/dom/scripts/htmleventgenerator.py
@@ -114,7 +114,7 @@ _html_event_types = monitored.Dict('htmleventgenerator._html_event_types', {
   '*.webkitfullscreenchange': ('fullscreenChange', 'Event'),
   '*.webkitfullscreenerror': ('fullscreenError', 'Event'),
   '*.wheel': ('wheel', 'WheelEvent'),
-  'AbstractWorker.error': ('error', 'Event'),
+  'AbstractWorker.error': ('error', 'ErrorEvent'),
   'AudioContext.complete': ('complete', 'Event'),
   'ApplicationCache.cached': ('cached', 'Event'),
   'ApplicationCache.checking': ('checking', 'Event'),
@@ -123,7 +123,7 @@ _html_event_types = monitored.Dict('htmleventgenerator._html_event_types', {
   'ApplicationCache.obsolete': ('obsolete', 'Event'),
   'ApplicationCache.progress': ('progress', 'ProgressEvent'),
   'ApplicationCache.updateready': ('updateReady', 'Event'),
-  'CompositorWorker.error': ('error', 'Event'),
+  'CompositorWorker.error': ('error', 'ErrorEvent'),
   'Document.readystatechange': ('readyStateChange', 'Event'),
   'Document.securitypolicyviolation': ('securityPolicyViolation', 'SecurityPolicyViolationEvent'),
   'Document.selectionchange': ('selectionChange', 'Event'),
@@ -191,7 +191,7 @@ _html_event_types = monitored.Dict('htmleventgenerator._html_event_types', {
   'RTCPeerConnection.removestream': ('removeStream', 'MediaStreamEvent'),
   'RTCPeerConnection.signalingstatechange': ('signalingStateChange', 'Event'),
   'ScriptProcessorNode.audioprocess': ('audioProcess', 'AudioProcessingEvent'),
-  'SharedWorker.error': ('error', 'Event'),
+  'SharedWorker.error': ('error', 'ErrorEvent'),
   'SharedWorkerGlobalScope.connect': ('connect', 'Event'),
   'SpeechRecognition.audioend': ('audioEnd', 'Event'),
   'SpeechRecognition.audiostart': ('audioStart', 'Event'),
@@ -223,7 +223,7 @@ _html_event_types = monitored.Dict('htmleventgenerator._html_event_types', {
   'Window.pageshow': ('pageShow', 'Event'),
   'Window.progress': ('progress', 'Event'),
   'Window.webkittransitionend': ('webkitTransitionEnd', 'TransitionEvent'),
-  'Worker.error': ('error', 'Event'),
+  'Worker.error': ('error', 'ErrorEvent'),
   'XMLHttpRequestEventTarget.abort': ('abort', 'ProgressEvent'),
   'XMLHttpRequestEventTarget.error': ('error', 'ProgressEvent'),
   'XMLHttpRequestEventTarget.load': ('load', 'ProgressEvent'),
@@ -231,7 +231,7 @@ _html_event_types = monitored.Dict('htmleventgenerator._html_event_types', {
   'XMLHttpRequestEventTarget.loadstart': ('loadStart', 'ProgressEvent'),
   'XMLHttpRequestEventTarget.progress': ('progress', 'ProgressEvent'),
   'XMLHttpRequestEventTarget.timeout': ('timeout', 'ProgressEvent'),
-  'XMLHttpRequest.readystatechange': ('readyStateChange', 'Event'),
+  'XMLHttpRequest.readystatechange': ('readyStateChange', 'ProgressEvent'),
 })
 
 # These classes require an explicit declaration for the "on" method even though