Kill GetBrowserContextRedirectedInIncognito in extensions code

Replace with calls to ExtensionsBrowserClient::GetOriginalContext. This is part of a broader, ongoing effort to remove src/chrome dependences from src/apps and src/extensions.

BUG=341704

Review URL: https://codereview.chromium.org/157053004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249894 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249894
Remove NOTIMPLEMENTED noise in WebRtcVideoSinkAdapter

This code is getting called in practice (such as in
tab_capture_performance_tests) and spitting out noisy errors into logs.
I don't think this is should be a logged error to hit this code path
while these tests are still passing.

BUG=339891

Review URL: https://codereview.chromium.org/148853004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249895 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249895