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Create the provider and link it to the PolicyConnector.

Also make few changes in the Loader class:
1) It no longer inherits from ASyncPolicyLoader as the loader process
is sync.
2) Add few debug information in case the JSON input is not valid.

The provider is not disabled globally. There will be one last CL to
enable the provider on Android.

Bug: 1113792
Change-Id: Id32ec74ebfa259777f718bf06b7a4cb307498f2e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2355134Reviewed-by: Yann Dago <ydago@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798850}