Remove "video_capture" from modules' public_deps.

WebRTC standalone build may depend on "video_capture_internal_impl"
instead of "video_capture". Including "video_capture" in public_deps
leads to duplicated definition in this case.

BUG=None
NOTRY=True

Review-Url: https://codereview.webrtc.org/2657783002
Cr-Commit-Position: refs/heads/master@{#16279}

webrtc/modules/BUILD.gn

@@ -24,7 +24,6 @@ group("modules") {
     "remote_bitrate_estimator",
     "rtp_rtcp",
     "utility",
-    "video_capture",
     "video_coding",
     "video_processing",
   ]