Make /deep/ as no-op and remove ::shadow in dynamic profile

Intent to Remove: https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/HX5Y8Ykr5Ns

To make this CL small one, and easy to be reverted, all tests which depend on /deep/
(or ::shadow) were either removed or updated in another CL:
https://bugs.chromium.org/p/chromium/issues/detail?id=715034.

This CL only touched the small part so that users can't use /deep/ or ::shadow
in CSS dynamic profile in M60. The further internal clean up is needed in other CLs.

BUG=489954

Review-Url: https://codereview.chromium.org/2778983006
Cr-Commit-Position: refs/heads/master@{#471684}
12 files changed