Renames test::VideoCapturer to TestVideoCapturer.

Bug: webrtc:9620
Change-Id: Ia9afbc2d4f0448f9479516baa741d925a0aca5ac
Reviewed-on: https://webrtc-review.googlesource.com/93760
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24346}
diff --git a/test/call_test.h b/test/call_test.h
index 54be39a..f6c7e7f 100644
--- a/test/call_test.h
+++ b/test/call_test.h
@@ -190,7 +190,7 @@
 
   test::FrameGeneratorCapturer* frame_generator_capturer_;
   std::vector<rtc::VideoSourceInterface<VideoFrame>*> video_sources_;
-  std::vector<std::unique_ptr<VideoCapturer>> video_capturers_;
+  std::vector<std::unique_ptr<TestVideoCapturer>> video_capturers_;
   DegradationPreference degradation_preference_ =
       DegradationPreference::MAINTAIN_FRAMERATE;