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Updates Audio/Video Decoder to reject invalid codecs passed to
configure(). A TypeError should be thrown.

Additionally, if the config is valid but unsupported,
throw a NotSupportedError.

Adds wpt test to verify the behavior for validity. Support behavior
is difficult to wpt test (varies by build/platform) - tested manually.

Bug: 1113824
Change-Id: I647c476fa32e684d57816222e1787aeb8f723c25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360312Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Chrome Cunningham <chcunningham@chromium.org>
Auto-Submit: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799271}