Removing video_{receive,send}_stream.h stub headers.

These headers have been moved to the right place in
https://codereview.webrtc.org/3000253002 and in
https://codereview.webrtc.org/3007553002/ we stopped to
depend on them internally.

This CL tries to remove the stubs from the root directory
so we can unblock crbug.com/611808.

BUG=webrtc:8107

Review-Url: https://codereview.webrtc.org/3011513002
Cr-Original-Commit-Position: refs/heads/master@{#19575}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: dad6198eeefe12de191a1287d24d2341ff3c0e82
3 files changed