MSE: Remove check for not 'updating' in {set,clear}LiveSeekableRange()

MSE: Remove check for not 'updating' in {set,clear}LiveSeekableRange()

Anticipating a spec change to remove this 'updating' check to fix
spec issue https://github.com/w3c/media-source/issues/118, these methods
no longer throw exception if any of the SourceBuffers in sourceBuffers
are currently updating.

[1] https://github.com/w3c/web-platform-tests/pull/3296

BUG=627880, 624037
TBR=chcunningham@chromium.org
TEST=Expected update [1, above] to upstream
wpt/media-source/mediasource-liveseekable.html fails before and passes
after this change (with --enable-experimental-web-platform-features in
both cases, of course).

Review-Url: https://codereview.chromium.org/2144063002
Cr-Commit-Position: refs/heads/master@{#405309}
(cherry picked from commit dbebef53441200e0ce94dcd41668df78c93f568e)

Committed: https://chromium.googlesource.com/chromium/src/+/9b7e73684803bcf4adb6b47af752d1b81ad200e2

[wolenetz, 2016-07-20 00:10:42]

Description was changed from

==========
MSE: Remove check for not 'updating' in {set,clear}LiveSeekableRange()

Anticipating a spec change to remove this 'updating' check to fix
spec issue https://github.com/w3c/media-source/issues/118, these methods
no longer throw exception if any of the SourceBuffers in sourceBuffers
are currently updating.

[1] https://github.com/w3c/web-platform-tests/pull/3296

BUG=627880,624037
TBR=chcunningham@chromium.org
TEST=Expected update [1, above] to upstream
wpt/media-source/mediasource-liveseekable.html fails before and passes
after this change (with --enable-experimental-web-platform-features in
both cases, of course).

Review-Url: https://codereview.chromium.org/2144063002
Cr-Commit-Position: refs/heads/master@{#405309}
(cherry picked from commit dbebef53441200e0ce94dcd41668df78c93f568e)
==========

to

==========
MSE: Remove check for not 'updating' in {set,clear}LiveSeekableRange()

Anticipating a spec change to remove this 'updating' check to fix
spec issue https://github.com/w3c/media-source/issues/118, these methods
no longer throw exception if any of the SourceBuffers in sourceBuffers
are currently updating.

[1] https://github.com/w3c/web-platform-tests/pull/3296

BUG=627880,624037
TBR=chcunningham@chromium.org
TEST=Expected update [1, above] to upstream
wpt/media-source/mediasource-liveseekable.html fails before and passes
after this change (with --enable-experimental-web-platform-features in
both cases, of course).

Review-Url: https://codereview.chromium.org/2144063002
Cr-Commit-Position: refs/heads/master@{#405309}
(cherry picked from commit dbebef53441200e0ce94dcd41668df78c93f568e)

Committed:
https://chromium.googlesource.com/chromium/src/+/9b7e73684803bcf4adb6b47af752...
==========

[wolenetz, 2016-07-20 00:10:43]

Committed patchset #1 (id:1) manually as
9b7e73684803bcf4adb6b47af752d1b81ad200e2.