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This changes the approach for including shared libs from DFMs a bit.
Instead of adding the native deps to the main lib, this change instead
keeps the native code in partitioned libs which are added to the base
module. This allows the DFMs folded into the chrome DFM to function as
much as possible like they would normally, and also saves us from
loading native code from the DFMs if it's not needed.

This change also adds loadable modules from DFMs into the base module if
the chrome module is enabled.

Bug: 1126301
Change-Id: Iff5466b62a1adbbf0bce730df66e7116759d5df5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2416725Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808202}