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ImageFetchTabHelper will be able to get image data by both JavaScript and
image_fetcher::IOSImageDataFetcherWrapper. The image_fetcher ivar of BVC
can be removed once this is completed.

Bug: 163201
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ie5bb9279c5fb19498d3cde4c37cdf8944baa9e98
Reviewed-on: https://chromium-review.googlesource.com/1181571Reviewed-by: Matt Menke <mmenke@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Commit-Queue: Yi Su <mrsuyi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586032}