Roll PDFium from 8ee14407329b to d257440b81e5 (13 revisions)

https://pdfium.googlesource.com/pdfium.git/+log/8ee14407329b..d257440b81e5

2020-06-19 thestig@chromium.org Rearrange CFX_CSSSelector::FromString().
2020-06-19 thestig@chromium.org Use more WideStringViews in CFX_CSSSelector.
2020-06-18 thestig@chromium.org Remove a TODO related to C++14.
2020-06-18 thestig@chromium.org Remove CFX_CSSSelector::set_next().
2020-06-18 thestig@chromium.org Remove CFX_CSSSelectorType.
2020-06-18 thestig@chromium.org Make CFX_CSSSelector better match Chromium style.
2020-06-18 thestig@chromium.org Clean up CFX_CSSSelector:
2020-06-18 thestig@chromium.org Reset context after running CXFA_TextLayout::LayoutInternal().
2020-06-18 virens@microsoft.com Add function to get FPDF_ANNOTATION from FPDF_LINK
2020-06-18 thestig@chromium.org Clang format the code base.
2020-06-18 thestig@chromium.org Mark more parameters in image loading code const.
2020-06-18 thestig@chromium.org Change several enums to follow the style guide.
2020-06-18 thestig@chromium.org Check input param consistently in FPDFPageObjMark_*.

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/pdfium-autoroll
Please CC pdfium-deps-rolls@chromium.org on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Bug: chromium:997412
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: Ifb941c78e966a22f8b9f521634e135dc60c9a403
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253721Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#780219}

DEPS

@@ -202,7 +202,7 @@ 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': '8ee14407329b8ed5661c53ad33a2385bc3c491cf',
+  'pdfium_revision': 'd257440b81e54d48ebbb6afd046a9776246c15b6',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.