Merge M54: Load live version when reloading an offline page on connected network

Merge M54: Load live version when reloading an offline page on connected network

In order to trigger reloading currently-displayed as offline page with
network condition check, we resend the request with same extra request
header with reason field updated.

BUG=644943
Review-Url: https://codereview.chromium.org/2337363002
Cr-Commit-Position: refs/heads/master@{#419868}
(cherry picked from commit f68c52f414b7b785720faf53458df2517e921c9e)

Committed: https://chromium.googlesource.com/chromium/src/+/910386ff9b57445af8966322a34fe578dbba6681

[jianli, 2016-09-21 20:01:22]

Description was changed from

==========
Merge M54: Load live version when reloading an offline page on connected network

In order to trigger reloading currently-displayed as offline page with
network condition check, we resend the request with same extra request
header with reason field updated.

BUG=644943

Review-Url: https://codereview.chromium.org/2337363002
Cr-Commit-Position: refs/heads/master@{#419868}
(cherry picked from commit f68c52f414b7b785720faf53458df2517e921c9e)
==========

to

==========
Merge M54: Load live version when reloading an offline page on connected network

In order to trigger reloading currently-displayed as offline page with
network condition check, we resend the request with same extra request
header with reason field updated.

BUG=644943

Review-Url: https://codereview.chromium.org/2337363002
Cr-Commit-Position: refs/heads/master@{#419868}
(cherry picked from commit f68c52f414b7b785720faf53458df2517e921c9e)

Committed:
https://chromium.googlesource.com/chromium/src/+/910386ff9b57445af8966322a34f...
==========

[jianli, 2016-09-21 20:01:23]

Committed patchset #1 (id:1) manually as
910386ff9b57445af8966322a34fe578dbba6681.