ImageCapture: introduce image_capture Blob to allow move-only semantics

media/capture/video/video_capture_device.h

Index: media/capture/video/video_capture_device.h
diff --git a/media/capture/video/video_capture_device.h b/media/capture/video/video_capture_device.h
index a1707d5da713fb1a8ed8c1ffe470cba9261c31ba..4671df63f364c5dde04c4f08fa7f3e875983af6c 100644
--- a/media/capture/video/video_capture_device.h
+++ b/media/capture/video/video_capture_device.h
@@ -325,8 +325,8 @@ class CAPTURE_EXPORT VideoCaptureDevice {
   // Asynchronously takes a photo, possibly reconfiguring the capture objects
   // and/or interrupting the capture flow. Runs |callback| on the thread
   // where TakePhoto() is called, if the photo was successfully taken.
-  using TakePhotoCallback = ScopedResultCallback<
-      base::Callback<void(const std::string&, const std::vector<uint8_t>&)>>;
+  using TakePhotoCallback =
+      ScopedResultCallback<base::Callback<void(mojom::BlobPtr blob)>>;
   virtual void TakePhoto(TakePhotoCallback callback);
 
   // Gets the power line frequency, either from the params if specified by the