Removing reloadAll() from InstallEvent

As it's gone from the spec and the blink impl just throws an exception
removing it.

BUG=428512

Review URL: https://codereview.chromium.org/690753007

git-svn-id: svn://svn.chromium.org/blink/trunk@184659 bbb929c8-8fbe-4397-9dbb-9b2b20218538