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This patch removes download home dependencies from the DownloadGlue
class and the DownloadManagerUiConfig class.

- For DownloadGlue, a LegacyDownloadProvider interface is exposed and
passed through.  This allows the implementation to still live publicly
until we can remove the whole chain.

- For DownloadManagerUiConfig, pull out the component that reads from
ChromeFeatureList and move it to a helper class to build the config from
feature flags.

Bug: 1025395
Change-Id: I8c36f2dcab192ff3f93aeb0ee2a99c01b568af5f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1919909
Commit-Queue: David Trainor <dtrainor@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735540}