ShapeDetection: Add ShapeDetectionProvider as a factory for FaceDetection
service.
Remove |FaceDetectorOptions| from FaceDetection mojo interface so Blink
doesn't need to send it every time detect() is called.
BUG=
646083
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_site_isolation
Committed:
https://crrev.com/b68a77d89a69697c9e376fbaca9a9db07b4896eb
Cr-Commit-Position: refs/heads/master@{#438582}