Revert of [NTP Snippets] Refresh the displayed snippets less frequently

Revert of [NTP Snippets] Refresh the displayed snippets less frequently (patchset #7 id:120001 of https://codereview.chromium.org/1888913002/ )

Reason for revert:
testSnippetLoading is failing. Opened new bug: crbug.com/604763

Original issue's description:
> [NTP Snippets] Refresh the displayed snippets less frequently
>
> The fetch frequence of the snippet service does not change, but the
> snippets are now refreshed less frequently on the UI. They are pulled
> when the NTP is opened, or when the user switches back to it from
> another tab or another app.
>
> Additionally, we also change the way the list is updated, adding only
> new entries instead of clearing the old list and replacing it with
> the new one.
>
> BUG=601757
>
> Committed: https://crrev.com/104124354787e845e02db283185d499232518dd6
> Cr-Commit-Position: refs/heads/master@{#388195}

TBR=treib@chromium.org,bauerb@chromium.org,dgn@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=601757
Committed: https://crrev.com/71a6f5091c48bb552b63613b8666a4b4ac6dcc7d
Cr-Commit-Position: refs/heads/master@{#388218}

[cmumford, 2016-04-19 16:22:39]

Created Revert of [NTP Snippets] Refresh the displayed snippets less frequently

[commit-bot: I haz the power, 2016-04-19 16:23:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1897313002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1897313002/1

[commit-bot: I haz the power, 2016-04-19 16:23:44]

Committed patchset #1 (id:1)

[dgn, 2016-04-19 16:37:26]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1898213002/ by dgn@chromium.org.

The reason for reverting is: Fixing.

[commit-bot: I haz the power, 2016-04-22 19:12:39]

Description was changed from

==========
Revert of [NTP Snippets] Refresh the displayed snippets less frequently
(patchset #7 id:120001 of https://codereview.chromium.org/1888913002/ )

Reason for revert:
testSnippetLoading is failing. Opened new bug: crbug.com/604763

Original issue's description:
> [NTP Snippets] Refresh the displayed snippets less frequently
> 
> The fetch frequence of the snippet service does not change, but the
> snippets are now refreshed less frequently on the UI. They are pulled
> when the NTP is opened, or when the user switches back to it from
> another tab or another app.
> 
> Additionally, we also change the way the list is updated, adding only
> new entries instead of clearing the old list and replacing it with
> the new one.
> 
> BUG=601757
> 
> Committed: https://crrev.com/104124354787e845e02db283185d499232518dd6
> Cr-Commit-Position: refs/heads/master@{#388195}

TBR=treib@chromium.org,bauerb@chromium.org,dgn@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=601757
==========

to

==========
Revert of [NTP Snippets] Refresh the displayed snippets less frequently
(patchset #7 id:120001 of https://codereview.chromium.org/1888913002/ )

Reason for revert:
testSnippetLoading is failing. Opened new bug: crbug.com/604763

Original issue's description:
> [NTP Snippets] Refresh the displayed snippets less frequently
>
> The fetch frequence of the snippet service does not change, but the
> snippets are now refreshed less frequently on the UI. They are pulled
> when the NTP is opened, or when the user switches back to it from
> another tab or another app.
>
> Additionally, we also change the way the list is updated, adding only
> new entries instead of clearing the old list and replacing it with
> the new one.
>
> BUG=601757
>
> Committed: https://crrev.com/104124354787e845e02db283185d499232518dd6
> Cr-Commit-Position: refs/heads/master@{#388195}

TBR=treib@chromium.org,bauerb@chromium.org,dgn@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=601757

Committed: https://crrev.com/71a6f5091c48bb552b63613b8666a4b4ac6dcc7d
Cr-Commit-Position: refs/heads/master@{#388218}
==========

[commit-bot: I haz the power, 2016-04-22 19:12:40]

Patchset 1 (id:??) landed as
https://crrev.com/71a6f5091c48bb552b63613b8666a4b4ac6dcc7d
Cr-Commit-Position: refs/heads/master@{#388218}