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- If the Discover Feed is OFF then the non refactored version (which
uses ContentSuggestionsVC as the main NTP VC) will be used, for this
container VC is created on NTPCoordinator which is returned to BVC.
The contained VC will change (between NTPVC and ContentSuggestionsVC)
depending on the Feed being ON or OFF.
- Adds an extra check on most IsRefactoredNTP calls, so the refactored
NTP is only used when the Discover Feed is on.
- Moves the NTPHomeMediator creation to NTPCoordinator.

Bug: 1114792
Change-Id: I64b82462825da7bd66f1004e89f55c64313f1dbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625508
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Adam Trudeau-Arcaro <adamta@google.com>
Cr-Commit-Position: refs/heads/master@{#843197}