Roll src/third_party/pdfium/ 08d96f1ca..473b4ae48 (4 commits)

https://pdfium.googlesource.com/pdfium.git/+log/08d96f1cadb1..473b4ae489e8

$ git log 08d96f1ca..473b4ae48 --date=short --no-merges --format='%ad %ae %s'
2018-05-15 thestig Lower the limit of image dimensions for fax codecs.
2018-05-15 thestig Read data in bigger chunks in fax codec code.
2018-05-15 thestig Clean up CBC_ASCIIEncoder.
2018-05-15 thestig Return earlier in CPDF_TextPage::ProcessInsertObject() when possible.

Created with:
  roll-dep src/third_party/pdfium
BUG=chromium:834633,chromium:834633


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: I67c2cecc2867cf1ea9506e502702c67a3b1f5843
Reviewed-on: https://chromium-review.googlesource.com/1058927Reviewed-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@{#558633}

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': '08d96f1cadb14d91b051e7568de0c43804ba7340',
+  'pdfium_revision': '473b4ae489e8c6d63b087693589eda03399f60f6',
   # 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.