Add wildcard support for Access-Control-Allow-Headers

Bug: 615313
Change-Id: I81b16ac260029bca2b72f700df8634af66ca7d2f
Reviewed-on: https://chromium-review.googlesource.com/668336
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Takeshi Yoshino <tyoshino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#504045}
3 files changed