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Implement OAuth2 authentication flow for Box to obtain authorization, refresh token, and access token using a pop-up window, and store
tokens into profile prefs.

This is part of a series that will eventually, if enabled by
enterprise admin, replace regular DownloadItemRenameHandler with
FileSystemConnectorRenameHandler, which uses FileSystemConnector to
redirect downloaded local temporary files to get uploaded through a
series of BoxApiCallFlow steps.

This CL does the following:

1/ Create new profile prefs to hold the OAuth2 tokens needed for file
system connectors. (connectors/connectors_prefs.h/cc)
2/ Implement UX for gathering Box user consent. This is being
implemented as pop-up window hosting the Box consent flow, much like
the force sign in dialog hosts the Google sign in flow. (connectors/
file_system/signin_dialog_delegate.h/cc)
3/ Implement OAuth2 flow to mint access and refresh tokens from user
consent’s auth_code.
4/ Implement OAuth2 flow to mint access and refresh tokens from the
previous refresh token. (connectors/file_system/
box_access_token_fetcher.h/cc)

BUG=1168607

Change-Id: If4882440315151a7cc23f2a6f56430bdb2bc09bf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2591667
Commit-Queue: Alice Gong <alicego@google.com>
Auto-Submit: Alice Gong <alicego@google.com>
Reviewed-by: Nicolas Ouellet-Payeur <nicolaso@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Roger Tawa <rogerta@chromium.org>
Reviewed-by: Marc-André Decoste <mad@chromium.org>
Reviewed-by: Dominique Fauteux-Chapleau <domfc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846300}