This roll:
- NetworkObserver now uses the `remote's` ChannelEventSink layer to
subscribe to redirects.
- Wheel events now must be dispatched from browser process.
- There's a new API for console messages
- The old methods to wait for search service and addon manager no longer
work; speculatively remove them since neither `remote` nor
`marionette` have anything like this.
Native manual merge: 9e6fcfd868
In the current tip-of-tree Firefox, document channel is enabled by
default, so we have to enable it in order to roll further.
This patch:
1. Removes content disposition sniffing from content process since it
crashes renderer with document channel.
2. Merges all page-related handlers in a single `PageHandler` and
serializes network events wrt the `Page.frameAttached` event.
The serialization mentioned in (2) is necessary: frame attachment is
reported from the content process, and network events are reported from
the browsers process. This is an inherent race, that becomes exposed by
the document channel.
On a side note, (2) makes it possible to synchronously report all
buffered events in `SimpleChannel` (cc offline discussion with @dgozman
that highlighted an unsighty approach that we currently employ there: reporting
events in a subsequent microtask.)
References #3995
