[Media>UI] Follow-up fix for avoiding downloading image twice

[Media>UI] Follow-up fix for avoiding downloading image twice

Previously the cached src for last media image will be reset when the
download callback returns a failure (404, image, etc.), thus the image
will be fetched another time when the session goes active. This CL
removes the reset in this case thus avoiding trying fetching the image
another time while already knowing it will fail.

BUG=672023
Review-Url: https://codereview.chromium.org/2629083004
Cr-Commit-Position: refs/heads/master@{#443871}
Committed: https://chromium.googlesource.com/chromium/src/+/27ecb94bbf93d0324fd74ca1f689e806cae2df51

[Zhiqiang Zhang (Slow), 2017-01-13 14:09:19]

zqzhang@chromium.org changed reviewers:
+ mlamouri@chromium.org

[Zhiqiang Zhang (Slow), 2017-01-13 14:09:19]

PTAL

A follow-up fix is per
https://bugs.chromium.org/p/chromium/issues/detail?id=672023#c13

[mlamouri (slow - plz ping), 2017-01-16 11:30:40]

The CQ bit was checked by mlamouri@chromium.org

[mlamouri (slow - plz ping), 2017-01-16 11:30:41]

lgtm

[commit-bot: I haz the power, 2017-01-16 11:30:53]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-01-16 12:05:09]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1484566240675950, "parent_rev":
"a0030054d0f06d89c91a0b6198a1956cd4915861", "commit_rev":
"27ecb94bbf93d0324fd74ca1f689e806cae2df51"}

[commit-bot: I haz the power, 2017-01-16 12:05:39]

Description was changed from

==========
[Media>UI] Follow-up fix for avoiding downloading image twice

Previously the cached src for last media image will be reset when the
download callback returns a failure (404, image, etc.), thus the image
will be fetched another time when the session goes active. This CL
removes the reset in this case thus avoiding trying fetching the image
another time while already knowing it will fail.

BUG=672023
==========

to

==========
[Media>UI] Follow-up fix for avoiding downloading image twice

Previously the cached src for last media image will be reset when the
download callback returns a failure (404, image, etc.), thus the image
will be fetched another time when the session goes active. This CL
removes the reset in this case thus avoiding trying fetching the image
another time while already knowing it will fail.

BUG=672023

Review-Url: https://codereview.chromium.org/2629083004
Cr-Commit-Position: refs/heads/master@{#443871}
Committed:
https://chromium.googlesource.com/chromium/src/+/27ecb94bbf93d0324fd74ca1f689...
==========

[commit-bot: I haz the power, 2017-01-16 12:05:40]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/27ecb94bbf93d0324fd74ca1f689...