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Currently change list loader and directory loader use AboutResourceLoader to
get the root folder id. However, with team drives the root folder id is a
constant (the team drive id) and we need a way to supply this value when the
change list loader and directory loader are loading changelists for team
drives.

The RootFolderIdLoader pure virtual class allows us to provide an abstraction
for reading the root folder id either from AboutResource or a constant string.

Bug: 835703, 715355
Change-Id: I7d0766c5f813353186d3fbd3f6b20219c809eb4e
Reviewed-on: https://chromium-review.googlesource.com/1068527
Commit-Queue: Stuart Langley <slangley@chromium.org>
Reviewed-by: Naoki Fukino <fukino@chromium.org>
Reviewed-by: Sasha Morrissey <sashab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561706}