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With intent-to-ship approved [1], this change undoes the ephemeral
origin trial integration previously landed in r581041 and ships
SourceBuffer.changeType() (so that its use no longer requires an
experimental flag.) This change retains the UseCounter for this
new MSE API method that was added in r581041.

[1] https://groups.google.com/a/chromium.org/d/topic/blink-dev/K_OFPxA_whE/discussion

BUG=605134

Change-Id: Ie10f8ef71513998dc8672786bc8fea12bb0ad150
Reviewed-on: https://chromium-review.googlesource.com/1182292Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Matthew Wolenetz <wolenetz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584848}