Roll src/third_party/pdfium/ 14f889750..486270509 (12 commits)

https://pdfium.googlesource.com/pdfium.git/+log/14f8897509d9..4862705090a7

$ git log 14f889750..486270509 --date=short --no-merges --format='%ad %ae %s'
2018-04-05 tsepez Make Internal field usage in cfxjs_engine match README.doc
2018-04-05 thestig Combine if/else blocks in CPDF_DIBSource::TranslateScanline24bpp().
2018-04-05 thestig Split CPDF_DIBSource::TranslateScanline24bpp().
2018-04-05 thestig Fix const casts in CPDF_Encryptor.
2018-04-05 thestig Get rid of a const_cast in CPDF_FlateEncoder.
2018-04-05 thestig Remove some const_casts in CPDF_Creator.
2018-04-05 dsinclair Make CXFA_Document::m_rgGlobalBinding private
2018-04-05 dsinclair Remove unused param.
2018-04-05 dsinclair Move document data merge code into CXFA_Document file
2018-04-05 rharrison Remove unused XFA Widget API methods
2018-04-05 thestig Ignore bad data in the shared object hint table.
2018-04-05 thestig Roll pdfium/third_party/freetype/src/ 7109495c5..26ad1acbc (2 commits)

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: I9f57c5782c3ec5ccaf49232d714bff5308f2cbd9
Reviewed-on: https://chromium-review.googlesource.com/999011Reviewed-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@{#548682}

DEPS

@@ -106,7 +106,7 @@ 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': '14f8897509d9db8739951a90488fb1634a497db5',
+  'pdfium_revision': '4862705090a7469115ae7e3c80143b6f8b6b527a',
   # 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.