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WebCallbacks is now solely used within by blink::ImageCaptureFrameGrabber.
This CL moves its definition out of the Blink exposed API into
image_capture_frame_grabber.h

This is a follow up of the following CLs:

- crrev.com/c/1546151
  (Remove the use of blink::ScopedWebCallbacks in MediaRecorderHandler::EncodingInfo)
- crrev.com/c/1546155
  (Remove the use of blink::ScopedWebCallbacks in TransmissionEncodingInfoHandler::EncodingInfo)
- crrev.com/c/1576468
  (Onion soup content/renderer/image_capture/)

In a final step, its complete removal will be pursued.

BUG=919392,945851
R=haraken@chromium.org

Change-Id: I35ee4c0cfb6a317f3e661859d3fed2447cc968ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610117
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#659162}