Move some Device Orientation bits from core/dom to modules/device_orientation

This CL moves a number of files for Device Orientation to where they should be, i.e. modules/device_orientation. This is in preparation for a larger refactoring to implement Device Orientation using the platform approach and hence unifying it with the Device Motion implementation.

BUG=261165

Review URL: https://chromiumcodereview.appspot.com/19644003

git-svn-id: svn://svn.chromium.org/blink/trunk@154454 bbb929c8-8fbe-4397-9dbb-9b2b20218538