[NTP] Do not force offline version when opening non-download snippets.

[NTP] Do not force offline version when opening non-download snippets.

Previously we always opened an offline page, if there was one. This CL
simply opens the URL for non-download snippets and then Offline Pages
decide whether to open its offline page. For Downloads nothing changed.

BUG=668485
Review-Url: https://codereview.chromium.org/2525323003
Cr-Commit-Position: refs/heads/master@{#434445}
(cherry picked from commit 6f538029f3659bf667470deca0b22abdcd7cafbd)

Committed: https://chromium.googlesource.com/chromium/src/+/5d36250aae160e1a5f37b80638bd5ef588bde6e1

[Marc Treib, 2016-12-05 15:05:19]

Description was changed from

==========
[NTP] Do not force offline version when opening non-download snippets.

Previously we always opened an offline page, if there was one. This CL
simply opens the URL for non-download snippets and then Offline Pages
decide whether to open its offline page. For Downloads nothing changed.

BUG=668485

Review-Url: https://codereview.chromium.org/2525323003
Cr-Commit-Position: refs/heads/master@{#434445}
(cherry picked from commit 6f538029f3659bf667470deca0b22abdcd7cafbd)
==========

to

==========
[NTP] Do not force offline version when opening non-download snippets.

Previously we always opened an offline page, if there was one. This CL
simply opens the URL for non-download snippets and then Offline Pages
decide whether to open its offline page. For Downloads nothing changed.

BUG=668485

Review-Url: https://codereview.chromium.org/2525323003
Cr-Commit-Position: refs/heads/master@{#434445}
(cherry picked from commit 6f538029f3659bf667470deca0b22abdcd7cafbd)

Committed:
https://chromium.googlesource.com/chromium/src/+/5d36250aae160e1a5f37b80638bd...
==========

[Marc Treib, 2016-12-05 15:05:20]

Committed patchset #2 (id:20001) manually as
5d36250aae160e1a5f37b80638bd5ef588bde6e1.