chromium: Remove all NSAPI browser wrappers.

Chromium doesn't support NSAPI anymore, so it doesn't make sense to keep
the wrappers, especially because some of them trigger bugs in more
recent versions of Chromium.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
chromium: Update beta and dev to latest versions.

beta: 37.0.2062.94 -> 38.0.2125.24 (builds fine, tested)
dev:  38.0.2125.8  -> 39.0.2138.3  (builds fine, tested)

Introduces the new version 39 and finally separates stable/beta again.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>