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The composing favicon logic comes from the explore_sites::ImageHelper.

This CL moves the composing logic to a different class, so it can be
shared with the FaviconHelper. In addition, this CL integrate the
composing logic to FaviconHelper.

Change-Id: I267d5611979875ae28e7df09bf0ef02c2206058e
Bug: 1064153
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2123513
Commit-Queue: Mei Liang <meiliang@chromium.org>
Reviewed-by: Cathy Li <chili@chromium.org>
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757728}