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MseBufferByPts was enabled by default in M75. This series of changes (in M76)
removes:

1) the tests for the old "LegacyByDts" MSE buffering logic (this change), and
2) the old "LegacyByDts" MSE buffering logic and the associated feature gating

Later changes will refactor the resulting "NewByPts" logic to remove
residual complications such as templating SourceBufferStream by range
buffering implementation and clean up confusing usage of DecodeTimestamp
where it really contains a presentation timestamp within and below
FrameProcessor.

Reduces media unittests count (roughly from 5635 to 5056).
Also, removes the LegacyByDts portion of each
mediasource_*_pipeline_integration_fuzzer

BUG=771349,760264,718641,639144
R=sandersd@chromium.org
CC=​​​​​​mmoroz@chromium.org

Change-Id: I0aca7e72abbf5353294c46876751884886382d2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1574608Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Matthew Wolenetz <wolenetz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658794}