Remove global set of ScopedStyleResolvers.

Remove global set of ScopedStyleResolvers.

Just walk the DOM instead. This will be slower, but I'm going to get rid
of the global RuleFeatureSet anyway, so this is just a temporary measure
to simplify the system. Removing the set also means removing a bunch of
special cases for when the document didn't have any ShadowRoots with
styles (which is very unlikely in Sky).

R=eseidel@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/2a1aa7b86a8110a99da9365feaba9d25c36bd5d9

[eseidel, 2014-12-16 23:53:28]

eseidel@chromium.org changed reviewers:
+ eseidel@chromium.org

[eseidel, 2014-12-16 23:53:28]

The CQ bit was checked by eseidel@chromium.org

[eseidel, 2014-12-16 23:53:29]

lgtm

[commit-bot: I haz the power, 2014-12-16 23:54:10]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-12-16 23:54:11]

Commit queue rejected this change because it did not recognize the base URL.
Please commit your change manually.

[esprehn, 2014-12-16 23:57:51]

Committed patchset #1 (id:1) manually as
2a1aa7b86a8110a99da9365feaba9d25c36bd5d9 (presubmit successful).