Move NamedGridLinesMap and OrderedNamedGridLines to their own files.

StyleGridData.h contains two typedefs: NamedGridLinesMap and
OrderedNamedGridLines. When we generate StyleGridData, StyleGridData.h
will be deleted, so those two typedefs can't stay in that file. This
patch moves the typedefs to their own files so that they still work
after we delete StyleGridData.h.

Bug: 628043
Change-Id: I7590b267ae532d23cf808117a096ff52a377c655
Reviewed-on: https://chromium-review.googlesource.com/527733
Reviewed-by: Bugs Nash <bugsnash@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#477879}
4 files changed