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In order to migrate the InstallHelpers out of chrome, their dependency
on SimpleConfirmInfoBarBuilder needs to be broken. This change creates a
class that both InstallHelpers can use, XrInstallInfoBar, which inherits
from the components ConfirmInfoBar. ArCoreInstallHelper is also modified
to take in a ContentInfoBarManager to display this item, so that it can
be moved to components when the corresponding ArCoreInstallUtils java
class can be moved. Unfortunately, content does not have a good way to
get the specific InfoBarManager at this time, so a wrapper class is
created to get the embedder-specific InfoBarManager.

Note that due to the dependency on the ArCoreShim, ArCoreInstallUtils
cannot be moved out of //chrome just yet.

Due to the fact that the VrCoreInstallHelper lives in the VR DFM, some
issues arose around strings when attempting to port it, so this change
only ports the ArCoreInstallHelper to the new classes.

Bug:1064073,960542

Change-Id: Icec9bd2535dde0378c16aafc9bafd98db4927ed2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2442990
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Piotr Bialecki <bialpio@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814368}