Remove redundant 'derived constraint space' setters from NGConstraintSpace

this is the exact copy of http://crrev.com/2515923002 that was reviewed and submitted. Unfortunately it had to be reverted because of the collision with another LayoutNG patch at the commit time.

Remove
  SetOverflowTriggersScrollbar
  SetFixedSize
  SetFragmentationType
  SetIsNewFormattingContext
  SetSize
  Size
from NGConstraintSpace. Use NGConstraintSpaceBuilder instead.

BUG=635619

Review-Url: https://codereview.chromium.org/2514343004
Cr-Commit-Position: refs/heads/master@{#433608}
6 files changed