Limit Link header based SW installations for fetches made by SW.

Limit Link header based SW installations for fetches made by SW.

To prevent a service worker from spawning new service workers in the
background, only process link headers on requests made by service
workers if the service worker is controlling at least one client.

BUG=662443
Review-Url: https://codereview.chromium.org/2512103003
Cr-Commit-Position: refs/heads/master@{#433489}
(cherry picked from commit e8313bb499c439b0a5091225faf97b06f4cf1182)

Committed: https://chromium.googlesource.com/chromium/src/+/f89f2f4beec7dc806420025f9b76d2c731f918b6

[Marijn Kruisselbrink, 2016-11-22 19:23:11]

Description was changed from

==========
Limit Link header based SW installations for fetches made by SW.

To prevent a service worker from spawning new service workers in the
background, only process link headers on requests made by service
workers if the service worker is controlling at least one client.

BUG=662443

Review-Url: https://codereview.chromium.org/2512103003
Cr-Commit-Position: refs/heads/master@{#433489}
(cherry picked from commit e8313bb499c439b0a5091225faf97b06f4cf1182)
==========

to

==========
Limit Link header based SW installations for fetches made by SW.

To prevent a service worker from spawning new service workers in the
background, only process link headers on requests made by service
workers if the service worker is controlling at least one client.

BUG=662443

Review-Url: https://codereview.chromium.org/2512103003
Cr-Commit-Position: refs/heads/master@{#433489}
(cherry picked from commit e8313bb499c439b0a5091225faf97b06f4cf1182)

Committed:
https://chromium.googlesource.com/chromium/src/+/f89f2f4beec7dc806420025f9b76...
==========

[Marijn Kruisselbrink, 2016-11-22 19:23:12]

Committed patchset #1 (id:1) manually as
f89f2f4beec7dc806420025f9b76d2c731f918b6.