[NTP Snippets] Fetcher: remove |overwrite| param

[NTP Snippets] Fetcher: remove |overwrite| param
There's really no point to it, and this lets us simplify things a bit.

BUG=587822
Committed: https://crrev.com/d8c3a33980dcfda6e3f622573be6ed5f14d597e0
Cr-Commit-Position: refs/heads/master@{#378478}

[Marc Treib, 2016-03-01 14:58:52]

treib@chromium.org changed reviewers:
+ bauerb@chromium.org

[Marc Treib, 2016-03-01 14:58:53]

PTAL!

[Bernhard Bauer, 2016-03-01 15:06:57]

lgtm

[Marc Treib, 2016-03-01 16:14:16]

The CQ bit was checked by treib@chromium.org

[commit-bot: I haz the power, 2016-03-01 16:14:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1756443002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1756443002/1

[commit-bot: I haz the power, 2016-03-01 16:30:24]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-03-01 16:30:27]

Try jobs failed on following builders:
  android_arm64_dbg_recipe on tryserver.chromium.android (JOB_FAILED,
https://build.chromium.org/p/tryserver.chromium.android/builders/android_arm6...)

[Marc Treib, 2016-03-01 16:56:31]

The CQ bit was checked by treib@chromium.org

[Marc Treib, 2016-03-01 16:56:31]

The patchset sent to the CQ was uploaded after l-g-t-m from bauerb@chromium.org
Link to the patchset: https://codereview.chromium.org/1756443002/#ps20001
(title: "fix test")

[commit-bot: I haz the power, 2016-03-01 16:56:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1756443002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1756443002/20001

[commit-bot: I haz the power, 2016-03-01 18:07:39]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-03-01 18:09:50]

Description was changed from

==========
[NTP Snippets] Fetcher: remove |overwrite| param
There's really no point to it, and this lets us simplify things a bit.

BUG=587822
==========

to

==========
[NTP Snippets] Fetcher: remove |overwrite| param
There's really no point to it, and this lets us simplify things a bit.

BUG=587822

Committed: https://crrev.com/d8c3a33980dcfda6e3f622573be6ed5f14d597e0
Cr-Commit-Position: refs/heads/master@{#378478}
==========

[commit-bot: I haz the power, 2016-03-01 18:09:53]

Patchset 2 (id:??) landed as
https://crrev.com/d8c3a33980dcfda6e3f622573be6ed5f14d597e0
Cr-Commit-Position: refs/heads/master@{#378478}