Decoupling video_capture_internal_imlp from Obj-C code

The goal of this CL is to separate Obj-C/Obj-C++ code from targets which have
also C++ code (see https://bugs.chromium.org/p/webrtc/issues/detail?id=7743
for more information).

BUG=webrtc:7743
NOTRY=True

Review-Url: https://codereview.webrtc.org/2992953002
Cr-Original-Commit-Position: refs/heads/master@{#19662}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 054b10882001974e419a808eea995f6d38a33ba3
1 file changed