Removing ServiceWorker's InstallEvent Interface.

LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js

Index: LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js b/LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js
index f4cb78b077a4a49fc017d59d321e3f9a82ca3163..c3fc52a380f96684aac3c26d246f58c70f9009fb 100644
--- a/LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js
+++ b/LayoutTests/http/tests/serviceworker/resources/interfaces-worker.js
@@ -72,10 +72,4 @@ promise_test(function(t) {
 
 test(function() {
     assert_equals(new ExtendableEvent('ExtendableEvent').type, 'ExtendableEvent');
-    assert_equals(new InstallEvent('InstallEvent').type, 'InstallEvent');
-
-    assert_equals(new InstallEvent('InstallEvent').cancelable, false);
-    assert_equals(new InstallEvent('InstallEvent').bubbles, false);
-    assert_equals(new InstallEvent('InstallEvent', { cancelable : true }).cancelable, true);
-    assert_equals(new InstallEvent('InstallEvent', { bubbles : true }).bubbles, true);
   }, 'Event constructors');