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See Intent to Deprecate
https://groups.google.com/a/chromium.org/d/msg/blink-dev/x54XtrTyOP8/4-5QZlZzDAAJ

MSE's resource is considered 'local' (we don't  manage the donwload -
the app does), so the HTML5 spec text around firing 'stalled' does not
apply. See discussion in https://crbug.com/517240

No change to 'stalled' event for 'remote' (src="somefile.webm") resources.

This CL also stops delaying the 'load' event for deferred media player
Load() execution. Load() may be deferred for an arbitrary number of
seconds, so we should not hold up the window's 'load' event. Prior to
this change, 'stalled' was serving the unintended roll of unblocking the
the 'load' event for deferred load()s that took > 3 seconds. With stall
now removed for MSE, this weird behavior was uncovered and remedied.

Bug: 517240, 836951
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I97f2bf972c79582d038e1215f5d630042656bd1c
Reviewed-on: https://chromium-review.googlesource.com/982564
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Matthew Wolenetz <wolenetz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562371}