Revert of Removed unused cricket::VideoCapturer methods

webrtc/media/engine/webrtcvideocapturer.cc

Index: webrtc/media/engine/webrtcvideocapturer.cc
diff --git a/webrtc/media/engine/webrtcvideocapturer.cc b/webrtc/media/engine/webrtcvideocapturer.cc
index a1848e933c82a6e0e2ca26865e839c4d06c6eeb0..114556411c63870ddccfdd90df42938e21a2c956 100644
--- a/webrtc/media/engine/webrtcvideocapturer.cc
+++ b/webrtc/media/engine/webrtcvideocapturer.cc
@@ -262,7 +262,7 @@
 CaptureState WebRtcVideoCapturer::Start(const VideoFormat& capture_format) {
   if (!module_) {
     LOG(LS_ERROR) << "The capturer has not been initialized";
-    return CS_FAILED;
+    return CS_NO_DEVICE;
   }
   if (start_thread_) {
     LOG(LS_ERROR) << "The capturer is already running";