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This also removes the "Experimental" from the API methods, as features
must make a breaking change when they leave origin trial.

Bug: 719176
Change-Id: I3daa6bbe82fda07a9f549672c7b94269904059f0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037181Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739134}