Roll DEPS for sfntly b18b09b..1ef790a

https://chromium.googlesource.com/external/github.com/googlei18n/sfntly/+log/b18b09b..1ef790a

1ef790a Add missing header from commit c9025ecc.
6917286 Merge pull request #58 from leizleiz/leizleiz-lotsofchecks
4f1aa49 Add ReadableFontData::kInvalidUnsigned.
c9025ec Add more bounds checks in WritableFontData.
dd23046 Return error values in ReadableFontData::Read*().
813efeb Add a size limit for font tables.
08652be Add a nullptr check to GlyphTable::Glyph().

BUG=641330,641446,641460,642300
TBR=behdad@chromium.org

Review-Url: https://codereview.chromium.org/2316303003
Cr-Commit-Position: refs/heads/master@{#417229}

DEPS

@@ -32,7 +32,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling sfntly
   # and whatever else without interference from each other.
-  'sfntly_revision': 'b18b09b6114b9b7fe6fc2f96d8b15e8a72f66916',
+  'sfntly_revision': '1ef790afdd7818c1a3c76b18daacff14fdb983aa',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.