Roll src/third_party/pdfium/ cef20d4b2..12ec6760a (2 commits)

https://pdfium.googlesource.com/pdfium.git/+log/cef20d4b2ff1..12ec6760afd9

$ git log cef20d4b2..12ec6760a --date=short --no-merges --format='%ad %ae %s'
2017-12-04 thestig Simplify some CFX_FloatRect methods.
2017-12-04 thestig Simplify color calculations in CFX_ImageTransformer.

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: I46964f8496c6e7569ef1154295e0ec8894e3ddaa
Reviewed-on: https://chromium-review.googlesource.com/806765
Reviewed-by: <pdfium-deps-roller@chromium.org>
Commit-Queue: <pdfium-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521532}

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': 'cef20d4b2ff15d39ccfebeebd6616ee277fcd159',
+  'pdfium_revision': '12ec6760afd92b63d185854008a55762fe39f866',
   # 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.