Webapps don't integrating in Unity

[Maxim]

Such list of tested webapps aren't making any Unity integration since 14.04:
YouTube; vkcom; YandexMusic; GMail; lastfm

Althoug they are working in 13.10 as expected.

They no more openning in default browser, but they do in webbrowser-app, even when installed by default browser.
It's both correct for firefox, chromium and opera(other user says)

Distributor ID: Ubuntu
Description: Ubuntu 14.04.1 LTS
Release: 14.04
Codename: trusty

Firefox version: 31.0

Chromium version: Chromium 34.0.1847.116 Ubuntu 14.04 aura

Opera: ???

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: unity-webapps-service 2.5.0~+14.04.20140409-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Aug 2 10:58:47 2014
ExecutablePath: /usr/lib/libunity-webapps/unity-webapps-service
SourcePackage: libunity-webapps
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[David Barth (dbarth)]

The bug is about functional issues wrt unity integation APIs. The webapps do now open in their dedicated container in 14.04 LTS.

[Maxim (work-maydjin)]

Also there many of webapps don't work, as in 13.10, even in webbrowser-app.
Were tested:
vkcom
YouTube
GMail

There was broken integration in indicators and launcher panel.
All of this looks like compatibility break in api layer.

[Maxim (work-maydjin)]

Is there any workaround?
Or how i can practicipate on this issue?