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Follow-up downstream CL: https://crrev.com/i/1309325

Image fetcher has very few dependencies (BitmapCache and
ConversionUtils), so it is a good candidate for the lib/ layer.

Created lib/util to house classes in the util package that can be easily
moved. The rest will be moved later, when their dependencies, including
some resources, are also split out. There may be browser-specific util
classes that remain in browser.util.

TBR +base/android DEPS addition since these libraries being moved
already depend on base.

Tbr: nyquist@chromium.org
Bug: 846440
Change-Id: I9be429ec8789438a34314a3da6a02119f6c3e549
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1614967
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Reviewed-by: Brandon Wylie <wylieb@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Auto-Submit: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#668953}