DevTools: Clean up the Event Listeners pane data representation

LayoutTests/inspector/elements/event-listener-sidebar-expected.txt

Index: LayoutTests/inspector/elements/event-listener-sidebar-expected.txt
diff --git a/LayoutTests/inspector/elements/event-listener-sidebar-expected.txt b/LayoutTests/inspector/elements/event-listener-sidebar-expected.txt
index d2139a4c8eae5921d2dec47a9fa83ac7a71a1a9b..8240741081fcb943b26381f26531ddfd6a787a9c 100644
--- a/LayoutTests/inspector/elements/event-listener-sidebar-expected.txt
+++ b/LayoutTests/inspector/elements/event-listener-sidebar-expected.txt
@@ -4,98 +4,58 @@ Inspect Me
 
 ======== click ========
 [expanded] document event-listener-sidebar.html:19
+    attachment: script
     handler: function (event) { console.log("click - document - capturing"); }
-    isAttribute: false
-    lineNumber: 19
-    listenerBody: function (event) { console.log("click - document - capturing"); }
     node: #document
-    sourceName: [clipped-for-test]/LayoutTests/inspector/elements/event-listener-sidebar.html
-    type: click
     useCapture: true
 [expanded] document event-listener-sidebar.html:25
+    attachment: script
     handler: ObjectHandler
-    isAttribute: false
-    lineNumber: 25
-    listenerBody: function ObjectHandler() { document.addEventListener("click", this, true); }
     node: #document
-    sourceName: [clipped-for-test]/LayoutTests/inspector/elements/event-listener-sidebar.html
-    type: click
     useCapture: true
 [expanded] document event-listener-sidebar.html:31
+    attachment: script
     handler: EventListenerImpl
-    isAttribute: false
-    lineNumber: 31
-    listenerBody: function () { console.log("click - document - handleEvent"); }
     node: #document
-    sourceName: [clipped-for-test]/LayoutTests/inspector/elements/event-listener-sidebar.html
-    type: click
     useCapture: true
 [expanded] button#node event-listener-sidebar.html:15
+    attachment: script
     handler: function (event) { console.log("click - button - capturing"); }
-    isAttribute: false
-    lineNumber: 15
-    listenerBody: function (event) { console.log("click - button - capturing"); }
     node: button#node
-    sourceName: [clipped-for-test]/LayoutTests/inspector/elements/event-listener-sidebar.html
-    type: click
     useCapture: true
 [expanded] button#node event-listener-sidebar.html:12
+    attachment: script
     handler: function clickHandler(event) { console.log("click - button - bubbling (registered before attribute)"); }
-    isAttribute: false
-    lineNumber: 12
-    listenerBody: function clickHandler(event) { console.log("click - button - bubbling (registered before attribute)"); }
     node: button#node
-    sourceName: [clipped-for-test]/LayoutTests/inspector/elements/event-listener-sidebar.html
-    type: click
     useCapture: false
 [expanded] button#node event-listener-sidebar.html:16
+    attachment: attribute
     handler: function (event) { console.log("click - button - attribute"); }
-    isAttribute: true
-    lineNumber: 16
-    listenerBody: function (event) { console.log("click - button - attribute"); }
     node: button#node
-    sourceName: [clipped-for-test]/LayoutTests/inspector/elements/event-listener-sidebar.html
-    type: click
     useCapture: false
 [expanded] button#node event-listener-sidebar.html:17
+    attachment: script
     handler: function (event) { console.log("click - button - bubbling (registered after attribute)"); }
-    isAttribute: false
-    lineNumber: 17
-    listenerBody: function (event) { console.log("click - button - bubbling (registered after attribute)"); }
     node: button#node
-    sourceName: [clipped-for-test]/LayoutTests/inspector/elements/event-listener-sidebar.html
-    type: click
     useCapture: false
 [expanded] document event-listener-sidebar.html:6
+    attachment: attribute
     handler: function documentClickHandler(event) { console.log("click - document - attribute"); }
-    isAttribute: true
-    lineNumber: 6
-    listenerBody: function documentClickHandler(event) { console.log("click - document - attribute"); }
     node: #document
-    sourceName: [clipped-for-test]/LayoutTests/inspector/elements/event-listener-sidebar.html
-    type: click
     useCapture: false
 
 ======== custom event ========
 [expanded] body event-listener-sidebar.html:10
+    attachment: script
     handler: function f() {}
-    isAttribute: false
-    lineNumber: 10
-    listenerBody: function f() {}
     node: body
-    sourceName: [clipped-for-test]/LayoutTests/inspector/elements/event-listener-sidebar.html
-    type: custom event
     useCapture: true
 
 ======== hover ========
 [expanded] button#node event-listener-sidebar.html:14
+    attachment: script
     handler: function hoverHandler(event) { console.log("hover - button - bubbling"); }
-    isAttribute: false
-    lineNumber: 14
-    listenerBody: function hoverHandler(event) { console.log("hover - button - bubbling"); }
     node: button#node
-    sourceName: [clipped-for-test]/LayoutTests/inspector/elements/event-listener-sidebar.html
-    type: hover
     useCapture: false
 Listeners for selected node only(should be no listeners):