Merge M43: Allow "Run all plugins this time" if managed setting is click to play.

BUG=509169
TEST=set DefaultPluginsSetting to 3, visit site with Flash, verify "Run all plugins this time" link is enabled.

Review URL: https://codereview.chromium.org/1230953005

Cr-Commit-Position: refs/heads/master@{#338510}
(cherry picked from commit f71489f2413304bd5e9ff7ac58f96955eec91346)

Review URL: https://codereview.chromium.org/1239493003.

Cr-Commit-Position: refs/branch-heads/2357@{#498}
Cr-Branched-From: 59d4494849b405682265ed5d3f5164573b9a939b-refs/heads/master@{#323860}