Plugin Power Saver: --enable-plugin-power-saver only overrides ALLOW.

Plugin Power Saver: --enable-plugin-power-saver only overrides ALLOW.

--enable-plugin-power-saver flag previously overrode anything in the
content settings flag. This breaks for BLOCK setting and unauthorized
plugins, as the browser side needs to authorize the plugin first.

This patch restricts the flag to only impact users on ALLOW. This makes
sense to me, as the flag should not decrease the security of users
who have explicitly chosen ASK or BLOCK.

It will also dodge the bug.

BUG=448171, 403800
Committed: https://crrev.com/f3c163fbbd0170983268e0c6dd9a63e93e17f0c9
Cr-Commit-Position: refs/heads/master@{#313210}

[tommycli, 2015-01-26 20:33:43]

tommycli@chromium.org changed reviewers:
+ thestig@chromium.org

[tommycli, 2015-01-26 20:34:11]

thestig: ptal, thanks!!

[Lei Zhang, 2015-01-27 00:51:18]

lgtm

[tommycli, 2015-01-27 01:16:04]

The CQ bit was checked by tommycli@chromium.org

[commit-bot: I haz the power, 2015-01-27 01:17:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/876803005/1

[commit-bot: I haz the power, 2015-01-27 02:51:48]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-27 02:52:37]

Patchset 1 (id:??) landed as
https://crrev.com/f3c163fbbd0170983268e0c6dd9a63e93e17f0c9
Cr-Commit-Position: refs/heads/master@{#313210}