Fix for default value of FetchEvent.cancellable

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

 importScripts('interfaces.js');
 importScripts('worker-testharness.js');
 importScripts('/resources/testharness-helpers.js');
 
 var EVENT_HANDLER = 'object';
 
 test(function() {
     verify_interface('ServiceWorkerGlobalScope',
                      self,
                      {
@@ skipping 61 matching lines @@
 
 test(function() {
     assert_equals(
       new ExtendableEvent('ExtendableEvent').type,
       'ExtendableEvent', 'Type of ExtendableEvent should be ExtendableEvent');
     assert_equals(
       new FetchEvent('FetchEvent').type,
       'FetchEvent', 'Type of FetchEvent should be FetchEvent');
     assert_equals(
       new FetchEvent('FetchEvent').cancelable,
-      true, 'Default FetchEvent.cancelable should be true');
+      false, 'Default FetchEvent.cancelable should be false');
     assert_equals(
       new FetchEvent('FetchEvent').bubbles,
-      false, 'Default FetchEvent.bubbles should be true');
+      false, 'Default FetchEvent.bubbles should be false');

[jochen (gone - plz use gerrit), 2015/06/17 12:51:31]

why did this change? You only touched cancelable.

[Paritosh Kumar, 2015/06/17 13:15:32]

This was typo and corrected in a cl that get reverted. This should be false
only. If this is causing any confusion in this cl, then we can do in 
another cl. please suggest.

     assert_equals(
       new FetchEvent('FetchEvent').isReload,
       false, 'Default FetchEvent.isReload should be false');
     assert_equals(
       new FetchEvent('FetchEvent', {cancelable: false}).cancelable,
-      true, 'FetchEvent.cancelable should be true');
+      false, 'FetchEvent.cancelable should be false');
     assert_equals(
       new FetchEvent('FetchEvent', {isReload : true}).isReload, true,
       'FetchEvent.isReload with option {isReload : true} should be true');
     var req = new Request('http://localhost/',
                           {method: 'POST',
                            headers: [['Content-Type', 'Text/Html']]});
     assert_equals(
       new FetchEvent('FetchEvent', {request : req, isReload : true}).request.url,
       'http://localhost/',
       'FetchEvent.request.url should return the value it was initialized to');
   }, 'Event constructors');