**Note from VHP curators**: this commit is not fully imported into VHP.

      This was a refactoring in how #includes were handled
Absolutify paths to dom/.

BUG=234793
TBR=abarth

Review URL: https://codereview.chromium.org/14519003

git-svn-id: svn://svn.chromium.org/blink/trunk@149218 bbb929c8-8fbe-4397-9dbb-9b2b20218538