MSE: Relocate IncreaseDurationCB to LegacyFrameProcessor
Upcoming compliant FrameProcessor implementation will rely on
caller to update the duration to be more coherent with
HTMLMediaElement.buffered upon completing frame processing. Only the
LegacyFrameProcessor will use IncreaseDurationCB, so this change
pushes that callback purely into the legacy code.
R=acolwell@chromium.org
BUG=249422
TEST=All media_unittests and http/tests/media layout tests pass locally on Linux.
Review URL: https://codereview.chromium.org/
202583002
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257701 0039d316-1c4b-4281-b951-d872f2087c98