Revert of [Mojo Video Capture] Introduce abstraction VideoCaptureSystem

content/browser/renderer_host/media/buildable_video_capture_device.h

Index: content/browser/renderer_host/media/buildable_video_capture_device.h
diff --git a/content/browser/renderer_host/media/buildable_video_capture_device.h b/content/browser/renderer_host/media/buildable_video_capture_device.h
index e358435d24d771178c82297cef114192374ab885..3f41490a5974f891b8e9b128edbe58b56d889253 100644
--- a/content/browser/renderer_host/media/buildable_video_capture_device.h
+++ b/content/browser/renderer_host/media/buildable_video_capture_device.h
@@ -30,7 +30,11 @@
   class CONTENT_EXPORT Callbacks {
    public:
     virtual ~Callbacks() {}
-    virtual void OnDeviceStarted(VideoCaptureController* controller) = 0;
+    // Returns nullptr if no descriptor was found.
+    virtual const media::VideoCaptureDeviceDescriptor* LookupDeviceDescriptor(
+        const std::string& id) = 0;
+    virtual void WillStartDevice(media::VideoFacingMode facing_mode) = 0;
+    virtual void DidStartDevice(VideoCaptureController* controller) = 0;
     virtual void OnDeviceStartFailed(VideoCaptureController* controller) = 0;
     virtual void OnDeviceStartAborted() = 0;
   };