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wake lock: Update README.md.

The spec underwent many breaking changes this week, and the Blink
implementation was also updated to follow suit.

This CL makes README.md match the new API, the new classes and new
separation of concerns (e.g. the WakeLockController class in Blink was
merged into WakeLock itself).

Bug: 1015359
Change-Id: Ibd52542ef7421714db2180d1aa6c962515004166
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869213
Auto-Submit: Raphael Kubo da Costa <raphael.kubo.da.costa@intel.com>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707578}