Change POST-exclusion to idempotent-inclusion

Change POST-exclusion to idempotent-inclusion

The data saver proxy should only be used for idempotent methods, but
right now it only checks if the method is POST, which leaves out
other non-idempotent methods like PATCH. Instead of excluding POST and
PATCH, this will explicitly check if the method is GET, OPTIONS, HEAD,
PUT, DELETE, or TRACE.

BUG=614078
Review-Url: https://codereview.chromium.org/2001243002
Cr-Commit-Position: refs/heads/master@{#395502}
(cherry picked from commit fbc93e59b496ff6ea423527d1a3579fa8a2d061c)

Committed: https://chromium.googlesource.com/chromium/src/+/554bbbaa0daf530ff667372bc1db72dbe90f6b38

[tbansal1, 2016-05-25 18:11:36]

Description was changed from

==========
Change POST-exclusion to idempotent-inclusion

The data saver proxy should only be used for idempotent methods, but
right now it only checks if the method is POST, which leaves out
other non-idempotent methods like PATCH. Instead of excluding POST and
PATCH, this will explicitly check if the method is GET, OPTIONS, HEAD,
PUT, DELETE, or TRACE.

BUG=614078

Review-Url: https://codereview.chromium.org/2001243002
Cr-Commit-Position: refs/heads/master@{#395502}
(cherry picked from commit fbc93e59b496ff6ea423527d1a3579fa8a2d061c)
==========

to

==========
Change POST-exclusion to idempotent-inclusion

The data saver proxy should only be used for idempotent methods, but
right now it only checks if the method is POST, which leaves out
other non-idempotent methods like PATCH. Instead of excluding POST and
PATCH, this will explicitly check if the method is GET, OPTIONS, HEAD,
PUT, DELETE, or TRACE.

BUG=614078

Review-Url: https://codereview.chromium.org/2001243002
Cr-Commit-Position: refs/heads/master@{#395502}
(cherry picked from commit fbc93e59b496ff6ea423527d1a3579fa8a2d061c)

Committed:
https://chromium.googlesource.com/chromium/src/+/554bbbaa0daf530ff667372bc1db...
==========

[tbansal1, 2016-05-25 18:11:37]

Committed patchset #1 (id:1) manually as
554bbbaa0daf530ff667372bc1db72dbe90f6b38.