Roll src/third_party/pdfium/ 3f753f20e..d60609d3a (4 commits)

https://pdfium.googlesource.com/pdfium.git/+log/3f753f20e9c5..d60609d3a12f

$ git log 3f753f20e..d60609d3a --date=short --no-merges --format='%ad %ae %s'
2017-07-20 npm LibTIFF: remove a couple of patches
2017-07-20 dsinclair Add helper class to closed stream commands
2017-07-20 dsinclair Remove CLST_Rect and replace with CFX_FloatRect.
2017-07-20 dsinclair Convert CFX_ListItem to use CFX_FloatRect

Created with:
  roll-dep src/third_party/pdfium


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

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


TBR=dsinclair@chromium.org

Change-Id: I6117772462ccc70d152f7e51698151e1239db071
Reviewed-on: https://chromium-review.googlesource.com/580382
Reviewed-by: <pdfium-deps-roller@chromium.org>
Commit-Queue: <pdfium-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488570}

DEPS

@@ -64,7 +64,7 @@ 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': '3f753f20e9c51f7170a616a355b3f9578505c0ee',
+  'pdfium_revision': 'd60609d3a12fb0e9925166b027c3f57884b77c5d',
   # 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.