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A previous CL collaps transfer status on the C++ side.
Only a limit number of transfer status updates are passed through to JS.
This is blocking some testing automation: https://crbug.com/1136365#c19
For example, kComplete is mapped to kInProgress.
This CL map 1:1 for all statuses.

Manually verified using:
Nearby Share tile for receiving a file.
Nearby Share sheet to send a file.
As a sender from Nearby Share sheet, select the receiver at sender side then reject the connection at receiver side.
Run a JS script to register the onTransferUpdate event and check
kComplete can be received when transmission done.

Bug: 1149598
Change-Id: Ic5bfef95b4e51b16fbc895a42aad578840efa2dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2543528Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Eric Lin <ericth@google.com>
Cr-Commit-Position: refs/heads/master@{#828607}