Bug 880524 - Ignore chrome-document-global-created causing oranges

Ok so unlike #1025 this should actually fix the oranges. If read everything correctly now original fix did not actually did anything since I filtered "content-document-global-created" but Bug 880524 is caused by inconsistent `chrome-document-global-created` events. There for we still oranges since `chrome-document-global-created` seems to be present when they shouldn't: https://tbpl.mozilla.org/php/getParsedLog.php?id=24015116&tree=Jetpack#error0

This change put's back `content-document-global-created` events as they did not cause issues and remove `chrome-document-global-created`.

@erikvold could you please take a look and verify that I'm not missing something again ?