[DevTools] Properly handle cache-only requests when cache is disabled

[DevTools] Properly handle cache-only requests when cache is disabled

If a request is cache-only (e.g., back navigation to a POST) but "disable
cache" is checked in dev-tools, then set the cache policy to both load only
from cache and bypass the cache. This will result in the proper ERR_CACHE_MISS
from the network stack.

BUG=663728
Review-Url: https://codereview.chromium.org/2508473002
Cr-Commit-Position: refs/heads/master@{#432946}
(cherry picked from commit c1331a41ffd5d4dce093398c03619eb8cc06f323)

Committed: https://chromium.googlesource.com/chromium/src/+/8dd5e19d4d37ff197289108866705a65ce44a8e6

[jkarlin, 2016-11-21 13:09:17]

Description was changed from

==========
[DevTools] Properly handle cache-only requests when cache is disabled

If a request is cache-only (e.g., back navigation to a POST) but "disable
cache" is checked in dev-tools, then set the cache policy to both load only
from cache and bypass the cache. This will result in the proper ERR_CACHE_MISS
from the network stack.

BUG=663728

Review-Url: https://codereview.chromium.org/2508473002
Cr-Commit-Position: refs/heads/master@{#432946}
(cherry picked from commit c1331a41ffd5d4dce093398c03619eb8cc06f323)
==========

to

==========
[DevTools] Properly handle cache-only requests when cache is disabled

If a request is cache-only (e.g., back navigation to a POST) but "disable
cache" is checked in dev-tools, then set the cache policy to both load only
from cache and bypass the cache. This will result in the proper ERR_CACHE_MISS
from the network stack.

BUG=663728

Review-Url: https://codereview.chromium.org/2508473002
Cr-Commit-Position: refs/heads/master@{#432946}
(cherry picked from commit c1331a41ffd5d4dce093398c03619eb8cc06f323)

Committed:
https://chromium.googlesource.com/chromium/src/+/8dd5e19d4d37ff19728910886670...
==========

[jkarlin, 2016-11-21 13:09:19]

Committed patchset #1 (id:1) manually as
8dd5e19d4d37ff197289108866705a65ce44a8e6.