Roll pdfium. This brings in:

b72977f  Build with exceptions enabled on Windows too.
98a44a1  Fix the potential integer overflow from "offset + size".
5ffacd6  Fix bounds checking in CJS_PublicMethods::MakeRegularDate().

BUG=393831,382667
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/401883005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284290 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -77,7 +77,7 @@ 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": "6256a14279e46f1e893a32bf5102d698fe111cfa",
+  "pdfium_revision": "b72977f8c3efda2ceea6d25b1e042dfd6ea49c77",
   # 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.