Move white-space to be generated in ComputedStyleBase.

Move white-space to be generated in ComputedStyleBase. Also removed the
explicit value setters for EWhiteSpace. Also updated
SameSizeAsComputedStyle() to reflect the change in inherited data
bitfield size. This CL has reduced the size of ComputedStyle by 8 bytes.

BUG=628043

Review-Url: https://codereview.chromium.org/2555423002
Cr-Commit-Position: refs/heads/master@{#437322}
4 files changed