Make http/tests/media/audio-seekable-contains-zero-without-ranges.html work with multibuffers.

Make http/tests/media/audio-seekable-contains-zero-without-ranges.html work with multibuffers.

This failed on windows with multibuffers.
On all other platforms, the file is delivered immediately and the size is known, on windows it's a little
slower, and we must remember to copy the size of the file when we reach the end. This behavior is a direct
copy from buffered_data_source.cc, passes all tests so far and is unlikely to cause any problems.

BUG=612546
Review-Url: https://codereview.chromium.org/1983793003
Cr-Commit-Position: refs/heads/master@{#394217}
(cherry picked from commit 4d435e1e789fe2036570c608d024ba9bcbe64314)

Committed: https://chromium.googlesource.com/chromium/src/+/5e1ea09a8a6027398e41445245943a9a786854be

[hubbe, 2016-05-18 23:22:46]

Description was changed from

==========
Make http/tests/media/audio-seekable-contains-zero-without-ranges.html work with
multibuffers.

This failed on windows with multibuffers.
On all other platforms, the file is delivered immediately and the size is known,
on windows it's a little
slower, and we must remember to copy the size of the file when we reach the end.
This behavior is a direct
copy from buffered_data_source.cc, passes all tests so far and is unlikely to
cause any problems.

BUG=612546

Review-Url: https://codereview.chromium.org/1983793003
Cr-Commit-Position: refs/heads/master@{#394217}
(cherry picked from commit 4d435e1e789fe2036570c608d024ba9bcbe64314)
==========

to

==========
Make http/tests/media/audio-seekable-contains-zero-without-ranges.html work with
multibuffers.

This failed on windows with multibuffers.
On all other platforms, the file is delivered immediately and the size is known,
on windows it's a little
slower, and we must remember to copy the size of the file when we reach the end.
This behavior is a direct
copy from buffered_data_source.cc, passes all tests so far and is unlikely to
cause any problems.

BUG=612546

Review-Url: https://codereview.chromium.org/1983793003
Cr-Commit-Position: refs/heads/master@{#394217}
(cherry picked from commit 4d435e1e789fe2036570c608d024ba9bcbe64314)

Committed:
https://chromium.googlesource.com/chromium/src/+/5e1ea09a8a6027398e4144524594...
==========

[hubbe, 2016-05-18 23:22:48]

Committed patchset #1 (id:1) manually as
5e1ea09a8a6027398e41445245943a9a786854be.