hide SkBlurMaskFilter and SkBlurQuality

SK_SUPPORT_LEGACY_BLURMASKFILTER

Bug: skia:
Change-Id: Ic3e27e08e6e3cd2ffc1cd13b044e197bebc96236
Reviewed-on: https://skia-review.googlesource.com/113940
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
68 files changed