Roll pdfium to 59dffb68f07c7ce583285a23ad580b768ce3cd3e

59dffb6 Fix new third_party/BUILD.gn to use the right build config.
06b087a Set the freetype options missing in the recent update.
b3a3230 Add the license back to ftmodule.h after the freetype 2.5.4 upgrade.
a09d50d Transform font size to user space for valid text size comparison.
e4fc5ce Update freetype to 2.5.4.

BUG=407341,438441,444243
TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/815353002

Cr-Commit-Position: refs/heads/master@{#309342}

DEPS

@@ -68,7 +68,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.
-  'pdfium_revision': '5a35129bce7ca777e155e5498e8d4792fa6a4819',
+  'pdfium_revision': '59dffb68f07c7ce583285a23ad580b768ce3cd3e',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling openmax_dl
   # and whatever else without interference from each other.