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Before playing media using the MediaPlayerBridge, we try to parse the
metadata, using the MediaResourceGetter. This class uses the Android
MediaMetadataRetriever API, which can be be resource intensive. We
eventually get all of the metadata we need from the Android
MediaPlayer, and pre-parsing the metadata sometimes does nothing but
delay the start of playback.

This CL removes the java MediaResourceGetter, and removes metadata
extraction capabilities from the C++ portion of the
MediaResourceGetter interface.

NB: This is unlikely to have a performance effect on HLS playback,
since the MediaResourceGetter did not support parsing HLS.

Bug: 739914
Change-Id: I460d5aea02bf1a0bf099f66a781a40ca6374d4d0
Reviewed-on: https://chromium-review.googlesource.com/988681Reviewed-by: Peter Wen <wnwen@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548221}