Now that we have access to the RemoteWebProgress from the TabParent and can
construct RemoteWebProgress and RemoteWebProgressRequests in C++, we can
reconstruct the RemoteWebProgress and RemoteWebProgressRequest in the TabParent
instead of RemoteWebProgressManager. This improves the API for nsIBrowser and
RemoteWebProgressManager, removing the need for the
`callWebProgressContentBlockingEventListeners` method in both. It also means we
won't need to implement `callWebProgress*Listeners` for methods on nsIBrowser
and RemoteWebProgressManager for all other nsIWebProgress events.
Differential Revision: https://phabricator.services.mozilla.com/D24942
e463b26107