Fix -Wunreacheable-code on Mac.

After [1], Chromium Roll's CLs don't compile and test anything.

This needs to be fixed but in the meantime a breakage started
to happen. This CL fixes the problem.

[1] - https://chromium-review.googlesource.com/c/chromium/tools/build/+/2124478

TBR=mflodman@webrtc.org

No-Tree-Checks: true
Bug: None
Change-Id: Ia4ebe7bd1258755bec1c420763037b235dc7dab8
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/172091
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Magnus Flodman <mflodman@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30935}
diff --git a/modules/video_capture/test/video_capture_unittest.cc b/modules/video_capture/test/video_capture_unittest.cc
index 4a726db..be443e0 100644
--- a/modules/video_capture/test/video_capture_unittest.cc
+++ b/modules/video_capture/test/video_capture_unittest.cc
@@ -242,11 +242,6 @@
 #define MAYBE_Capabilities Capabilities
 #endif
 TEST_F(VideoCaptureTest, MAYBE_Capabilities) {
-#ifdef WEBRTC_MAC
-  printf("Video capture capabilities are not supported on Mac.\n");
-  return;
-#endif
-
   TestVideoCaptureCallback capture_observer;
 
   rtc::scoped_refptr<VideoCaptureModule> module(