Roll src/third_party/pdfium/ e053e0fd1..646257d65 (7 commits)

https://pdfium.googlesource.com/pdfium.git/+log/e053e0fd169a..646257d65c65

$ git log e053e0fd1..646257d65 --date=short --no-merges --format='%ad %ae %s'
2017-11-30 dsinclair Run clang-tidy google-readability-casting on //third_party/pdfium
2017-11-30 dsinclair Run clang-tidy modernize-use-nullptr on //third_party/pdfium
2017-11-30 jose.dapena GCC build fix: access from global function to private methods in CJS_PublicMethods.
2017-11-30 jose.dapena Add LG Electronics to the AUTHORS
2017-11-30 dsinclair Run clang-tidy modernize-use-bool-literals on //third_party/pdfium
2017-11-30 dsinclair Run clang-tidy modernize-use-auto on //third_party/pdfium
2017-11-30 dsinclair Run clang-tidy modernize-use-equals-{delete,default} on //third_party/pdfium

Created with:
  roll-dep src/third_party/pdfium


The AutoRoll server is located here: https://pdfium-roll.skia.org

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

If the roll is causing failures, please contact the current sheriff, who should
be CC'd on the roll, and stop the roller if necessary.


TBR=dsinclair@chromium.org

Change-Id: Id46ddaa6bda8deb93cd88350e2d743c71609cc68
Reviewed-on: https://chromium-review.googlesource.com/801190
Reviewed-by: <pdfium-deps-roller@chromium.org>
Commit-Queue: <pdfium-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520603}

DEPS

@@ -98,7 +98,7 @@ 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': 'e053e0fd169a62ce36b33e37b8ed6a1d29a77630',
+  'pdfium_revision': '646257d65c653acdf2bea96c69e0550ca03340c6',
   # 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.