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In summary this CL:

- Moves content/renderer/image_capture/image_capture_frame_grabber.cc|h
  to t_p/blink/renderer/modules/imagecapture/.
- Changes t_p/blink/renderer/modules/imagecapture/image_capture.cc to
  instantiate ImageCaptureFrameGrabber directly, instead of calling out
  to RendererBlinkPlatformImpl::CreateImageCaptureFrameGrabber().
- Removes WebImageCaptureFrameGrabber altogether.
- Removes the API in [1] creates WebImageCaptureFrameGrabber, as well as
  its overrides.

Additionally, in order to create CrossThreadBind instances that pass
ScopedWebCallbacks instances, a specialized template of CrossThreadCopier
was local to [2].

[1] third_party/blink/public/platform/platform.h
[2] third_party/blink/renderer/modules/imagecapture/image_capture_frame_grabber.cc

Change in [3] were needed to be extended in order to allow the use of
//media/base and //third_party/libyuv identifiers, similarly to media_capabilities
and mediastream blink modules.

[3] third_party/blink/tools/blinkpy/presubmit/audit_non_blink_usage.py

R=haraken@chromium.org
CC=​blink-reviews-blink@chromium.org

BUG=787245

Change-Id: I86f75aa6e3483db2d0b7e7243c7f9cc3239f9507
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1576468Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Antonio Gomes <tonikitoo@igalia.com>
Cr-Commit-Position: refs/heads/master@{#653466}