Replace kPreferHtmlOverPlugins feature checks with PluginUtils::ShouldPreferHtmlOverPlugins

Replace kPreferHtmlOverPlugins feature checks with PluginUtils::ShouldPreferHtmlOverPlugins

This replaces occurences of base::FeatureList::IsEnabled(features::kPreferHtmlOverPlugins)
with PluginUtils::ShouldPreferHtmlOverPlugins which includes extra checks to
determine whether the feature should be enabled. PreferHtmlOverPlugins should
not be enabled if an enterprise setting is set because it currently doesn't
work correctly when the enterprise setting is set to ASK. The Profile has been
plumbed through to places where it's needed in order to make checking this
possible.

BUG=654072
Review-Url: https://codereview.chromium.org/2408613002
Cr-Commit-Position: refs/heads/master@{#424583}
(cherry picked from commit b512db8bfb5266fb346540e24bca1416eb9260a7)

Committed: https://chromium.googlesource.com/chromium/src/+/9007bb1014ecfd5702041f3183397758edc9ed7b

[raymes, 2016-10-12 23:08:15]

Description was changed from

==========
Replace kPreferHtmlOverPlugins feature checks with
PluginUtils::ShouldPreferHtmlOverPlugins

This replaces occurences of
base::FeatureList::IsEnabled(features::kPreferHtmlOverPlugins)
with PluginUtils::ShouldPreferHtmlOverPlugins which includes extra checks to
determine whether the feature should be enabled. PreferHtmlOverPlugins should
not be enabled if an enterprise setting is set because it currently doesn't
work correctly when the enterprise setting is set to ASK. The Profile has been
plumbed through to places where it's needed in order to make checking this
possible.

BUG=654072

Review-Url: https://codereview.chromium.org/2408613002
Cr-Commit-Position: refs/heads/master@{#424583}
(cherry picked from commit b512db8bfb5266fb346540e24bca1416eb9260a7)
==========

to

==========
Replace kPreferHtmlOverPlugins feature checks with
PluginUtils::ShouldPreferHtmlOverPlugins

This replaces occurences of
base::FeatureList::IsEnabled(features::kPreferHtmlOverPlugins)
with PluginUtils::ShouldPreferHtmlOverPlugins which includes extra checks to
determine whether the feature should be enabled. PreferHtmlOverPlugins should
not be enabled if an enterprise setting is set because it currently doesn't
work correctly when the enterprise setting is set to ASK. The Profile has been
plumbed through to places where it's needed in order to make checking this
possible.

BUG=654072

Review-Url: https://codereview.chromium.org/2408613002
Cr-Commit-Position: refs/heads/master@{#424583}
(cherry picked from commit b512db8bfb5266fb346540e24bca1416eb9260a7)

Committed:
https://chromium.googlesource.com/chromium/src/+/9007bb1014ecfd5702041f318339...
==========

[raymes, 2016-10-12 23:08:18]

Committed patchset #1 (id:1) manually as
9007bb1014ecfd5702041f3183397758edc9ed7b.