GitLab

No longer show page actions in the location bar iff the
extension action redesign switch is enabled. In addition,
make all extensions tests* pass with the switch on! Woot!

*This is based on running these tests locally.  Once
https://codereview.chromium.org/489183005/ goes through,
I can push a run through the trybots with the switch on
by default for kicks and grins.

BUG=397259
BUG=408261

Review URL: https://codereview.chromium.org/516633002

Cr-Commit-Position: refs/heads/master@{#292648}