[DevTools] Do not expose agents on Target

third_party/WebKit/LayoutTests/inspector/input-event-warning.html

Index: third_party/WebKit/LayoutTests/inspector/input-event-warning.html
diff --git a/third_party/WebKit/LayoutTests/inspector/input-event-warning.html b/third_party/WebKit/LayoutTests/inspector/input-event-warning.html
index c4b5531ef402a0504423a49f4aebc437a5ba42b9..e8ca0a221f54d6e00867c690c7ec7df3bbab06b6 100644
--- a/third_party/WebKit/LayoutTests/inspector/input-event-warning.html
+++ b/third_party/WebKit/LayoutTests/inspector/input-event-warning.html
@@ -67,14 +67,14 @@ function test()
 
     function step1()
     {
-        InspectorTest.mainTarget.logAgent().startViolationsReport([
+        InspectorTest.mainTarget._dispatcher.logAgent().startViolationsReport([
             {name: 'blockedEvent', threshold: 30000}]);
         InspectorTest.evaluateInPage("dispatchEvents()", step2);
     }
 
     function step2()
     {
-        InspectorTest.mainTarget.logAgent().startViolationsReport([
+        InspectorTest.mainTarget._dispatcher.logAgent().startViolationsReport([
             {name: 'blockedEvent', threshold: 0.001}]);
         InspectorTest.addResult("There should be no warnings above this line");
         InspectorTest.evaluateInPage("dispatchEvents()", () => InspectorTest.completeTest());