Add once field to devtools so it can be queried by lighthouse.

third_party/WebKit/LayoutTests/inspector/elements/event-listener-sidebar-jquery1-expected.txt

Index: third_party/WebKit/LayoutTests/inspector/elements/event-listener-sidebar-jquery1-expected.txt
diff --git a/third_party/WebKit/LayoutTests/inspector/elements/event-listener-sidebar-jquery1-expected.txt b/third_party/WebKit/LayoutTests/inspector/elements/event-listener-sidebar-jquery1-expected.txt
index d529aba5ad352b793d0229bbfb89eb6afd3074ba..8232364f17077aeee61010e33211f5a1a555792b 100644
--- a/third_party/WebKit/LayoutTests/inspector/elements/event-listener-sidebar-jquery1-expected.txt
+++ b/third_party/WebKit/LayoutTests/inspector/elements/event-listener-sidebar-jquery1-expected.txt
@@ -7,21 +7,25 @@ Inspect Me
 [expanded] button#nodeRemoveevent-listener-sidebar-jquery1.html:11
     useCapture: true
     passive: false
+    once: false
     handler: function (){ console.log("second jquery"); }
 == frameworkUser
 [expanded] button#nodeRemoveevent-listener-sidebar-jquery1.html:10
     useCapture: true
     passive: false
+    once: false
     handler: function (){ console.log("first jquery"); }
 == normal
 [expanded] button#nodeRemoveevent-listener-sidebar-jquery1.html:12
     useCapture: false
     passive: false
+    once: false
     handler: function () { console.log("addEventListener"); }
 == frameworkInternal
 [expanded] button#nodeRemovejquery-1.11.3.min.js:4
     useCapture: false
     passive: false
+    once: false
     handler: function (a){return typeof m===K||a&&m.event.triggered===a.type?void 0:m.event.dispatch.apply(k.elem,arguments)}
 
 ======== load ========
@@ -29,6 +33,7 @@ Inspect Me
 [expanded] WindowRemoveevent-listener-sidebar-jquery1.html:36
     useCapture: false
     passive: false
+    once: false
     handler: function onload(event) {
   onloadHandler()
 }