Remove -webkit-auto, -webkit-center, -webkit-left, -webkit-right.

Remove -webkit-auto, -webkit-center, -webkit-left, -webkit-right.

These are values for text-align that align blocks in addition to
inline content. You can get the same centering affect with margin:auto.
If we want this functionality, we should implement it with the
same alignment APIs that we use for flexbox.

Delete unused methods/arguments from RenderBlockFlow.

No change in behavior. Just deleting dead code.

R=esprehn@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/e223e0c6d51f027196a2597b556641328a65d4b5

[esprehn, 2014-11-06 19:55:19]

esprehn@chromium.org changed reviewers:
+ esprehn@chromium.org

[esprehn, 2014-11-06 19:55:19]

lgtm

[ojan, 2014-11-06 19:55:54]

Committed patchset #2 (id:20001) manually as
e223e0c6d51f027196a2597b556641328a65d4b5 (presubmit successful).