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Convert both the implementation and clients in the browser and child
process for the content.mojom.ChildHistogramFetcherFactory and the
content.mojo.ChildHistogramFetcher interfaces to the new Mojo types.

Bug: 955171
Change-Id: I3e45219b9c027eb861507f7db9f0cac128eef5bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1798357Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Mario Sanchez Prada <mario@igalia.com>
Cr-Commit-Position: refs/heads/master@{#695955}