4909: Fixes #4908: Use notify instead of startForeground r=notwoods a=sblatz
Co-authored-by: Sawyer Blatz <sdblatz@gmail.com>

4901: Closes #4553: Migrate WindowFeature to browser-state r=grigoryk a=csadilek

This migrates our `WindowFeature` to `browser-state` and deletes the relevant code from `browser-session`.

Instead of keeping two distinct states for open and close window requests, this uses just one, which simplifies store observers (e.g the feature implementations). This wasn't really useful before anyway, so I decided to simplify here and introduce a type instead.

The `WindowFeature` now also uses our `TabsUseCases` to open and close tabs in response to window requests, instead of interacting with the `SessionManager` directly. This follows the same pattern as our other migrations. The use cases will be the final classes to migrate once everything else is done. For this to work, we need to move `WindowFeature` from `feature-session` to `feature-tabs` because otherwise we'd be introducing a dependency cycle. This is a better fit anyway, as the feature reacts to window request by opening and closing tabs, and a separate feature module seems unnecessary.  
Co-authored-by: Christian Sadilek <christian.sadilek@gmail.com>

4904:  GeckoView update (nightly) (20191031-142454) r=Amejia481 a=MickeyMoz
Co-authored-by: MickeyMoz <sebastian@mozilla.com>

4905:  GeckoView update (beta) (20191031-142530) r=Amejia481 a=MickeyMoz
Co-authored-by: MickeyMoz <sebastian@mozilla.com>

4897: Close issue #4876: Add UI for addon discovery and installation. r=csadilek a=Amejia481

[video](https://drive.google.com/file/d/13YqFm7uYh5Tk_h-l99Ca0HcCxQSBxloE/view?usp=sharing

)
Co-authored-by: Arturo Mejia <arturomejiamarmol@gmail.com>

4903:  Docs update (20191031-121254) [ci skip] r=Amejia481 a=MickeyMoz
Co-authored-by: MickeyMoz <sebastian@mozilla.com>

4900: Closes #4899: Sample browser crashes when using system engine r=Amejia481 a=csadilek

Similar to install our web extension features (readerview, icons, etc.), we just log and continue in this case.
Co-authored-by: Christian Sadilek <christian.sadilek@gmail.com>

4886: Closes #4809: Add WebPush abstraction to Engine  r=rocketsroger a=jonalmeida
Co-authored-by: Jonathan Almeida <jalmeida@mozilla.com>

4759: Download updates r=csadilek a=sblatz
Co-authored-by: Sawyer Blatz <sdblatz@gmail.com>

4895:  GeckoView update (nightly) (20191030-141345) r=Amejia481 a=MickeyMoz
Co-authored-by: MickeyMoz <sebastian@mozilla.com>

4743: Closes #4737: Support passing correct Socorro application details to lib-crash r=pocmo a=rocketsroger
Co-authored-by: Roger Yang <royang@mozilla.com>

4894:  Docs update (20191030-122632) [ci skip] r=Amejia481 a=MickeyMoz
Co-authored-by: MickeyMoz <sebastian@mozilla.com>

4892: Add back the @JvmOverloads to the Glean SDK public API r=Dexterp37 a=Dexterp37

This additionally adds unit testing in Java to make sure we're not regressing this again.

Note: this restores the annotations that were removed by #4620
Co-authored-by: Alessio Placitelli <alessio.placitelli@gmail.com>

4891: Bump the Glean SDK version to 19.1.0 r=pocmo a=Dexterp37

The list of changes is available here:

https://github.com/mozilla/glean/releases/tag/v19.1.0



Mostly bugfixes ;)
Co-authored-by: Alessio Placitelli <alessio.placitelli@gmail.com>

This additionally adds unit testing in Java to make sure
we're not regressing this again.

The list of changes is available here:

https://github.com/mozilla/glean/releases/tag/v19.1.0

Mostly bugfixes ;)

4877: Close issue #4876: Fix tracking protection not working properly on gecko-beta and gecko-stable r=csadilek a=Amejia481
Co-authored-by: Arturo Mejia <arturomejiamarmol@gmail.com>

4885: Closes #4884 Move Web Notifications Feature Changelog to Correct Version r=jonalmeida a=rocketsroger
Co-authored-by: Roger Yang <royang@mozilla.com>

4768: Closes #2295, #4549: Implement Web Notification Feature r=[jonalmeida,NotWoods] a=rocketsroger
Co-authored-by: Roger Yang <royang@mozilla.com>

4841: Closes #4776: Provide API for discovering supported addons r=csadilek a=Amejia481
Co-authored-by: Arturo Mejia <arturomejiamarmol@gmail.com>

gecko-beta and gecko-stable.

4875:  GeckoView update (nightly) (20191029-142345) r=Amejia481 a=MickeyMoz
Co-authored-by: MickeyMoz <sebastian@mozilla.com>