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Moves ArCoreInstallHelper to components, including supporting classes
ArCoreShim(Impl) and ArCoreInstallUtils and XrInstallInfoBar.
In order to fully move ArCoreInstallUtils, a ArCoreDeviceUtils class was
created to manage the last "init" that comes from the ChromeActivity.
Note that this is a remnant of the AR DFM which other embedders likely
won't need, and could theoretically be removed from //chrome.

In moving the "Install" and "Update" strings, they are made a bit more
generic, since nothing in them is unique to ArCore. The
ic_ar_core_install install graphic is an identical SVG version of the
icon currently being used. As there is a TODO to replace it, a new
graphic is used to allow for easier replacing.

Bug: 1064073,960542
Change-Id: I96c2be6182a5e6d9f09d268e98dbaef94ce68275
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2453873
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Piotr Bialecki <bialpio@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Auto-Submit: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816268}