Move DOMSecurityPolicy and DOMTimer to frame/

Move DOMSecurityPolicy and DOMTimer to frame/

I also moved WorkerNavigator to workers/

Almost all of the frame-level concepts are now gone from page/
However the dependencies between page/ and the rest of core/
are still all sorts of spaghetti.

The next step for OOPI will be to remove includes of the page/
directory from the rest of the core/ blink code.  This will
require adding abstractions to the various page-level concepts
which can be accessed off of Client objects held on Frame.
Just getting started.

BUG=305811
TBR=abarth@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=159416

[eseidel, 2013-10-11 03:31:48]

Committed patchset #1 manually as r159416 (presubmit successful).