Reland of Clean up unused cricket::VideoCapturer inclusion from mediaengine.h (patchset #1 id:1 of https://codereview.webrtc.org/2142893002/ )
Reland of Clean up unused cricket::VideoCapturer inclusion from mediaengine.h (patchset #1 id:1 of https://codereview.webrtc.org/2142893002/ )

Reason for revert:
Upstream fixed.

Original issue's description:
> Revert of Clean up unused cricket::VideoCapturer inclusion from mediaengine.h (patchset #1 id:1 of https://codereview.webrtc.org/2147443002/ )
>
> Reason for revert:
> Breaks up stream projects.
>
> Original issue's description:
> > Clean up unused cricket::VideoCapturer inclusion from mediaengine.h
> >
> > TBR=nisse@webrtc.org
> > BUG=webrtc:5426
> >
> > Committed: https://crrev.com/1e56991f248f8235c69cb3d95b35a44389c48354
> > Cr-Commit-Position: refs/heads/master@{#13446}
>
> TBR=nisse@webrtc.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=webrtc:5426
>
> Committed: https://crrev.com/3a9f41e584953226e43bf312ec59d625c97cfd62
> Cr-Commit-Position: refs/heads/master@{#13447}

TBR=nisse@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:5426

Review-Url: https://codereview.webrtc.org/2149533002
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#13456}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: e03c1618152824a980664536a64bc29d63740ad7

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