Roll src/third_party/pdfium/ 67268cd0e..33515fbec (7 commits)

https://pdfium.googlesource.com/pdfium.git/+log/67268cd0efa2..33515fbec463

$ git log 67268cd0e..33515fbec --date=short --no-merges --format='%ad %ae %s'
2018-05-16 thestig Do more optimizations to make FindBit() faster.
2018-05-16 tsepez Use pdfium::span<> in cpdf_crypto_handler.h
2018-05-16 thestig Avoid a memset() in FindBit() in the fax codec.
2018-05-16 tsepez Remove two unused #defines in cjs_globaldata.cpp.
2018-05-16 dsinclair Convert CJX_Object::Set* methods to return void
2018-05-16 tsepez Use pdfium::span<> in cpdf_creator.
2018-05-16 vmiklos core: allow building against system icu-uc

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: Ic7ab6344e11a92a497e419ccf03aa6a3518d2849
Reviewed-on: https://chromium-review.googlesource.com/1062493Reviewed-by: pdfium-chromium-autoroll <pdfium-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Commit-Queue: pdfium-chromium-autoroll <pdfium-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#559286}

DEPS

@@ -120,7 +120,7 @@ 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': '67268cd0efa2ebd3b27e963718e90b461e9f73b2',
+  'pdfium_revision': '33515fbec463e3038b3d54fb74fe4b51af1791c6',
   # 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.