Roll src/third_party/pdfium/ 6b26e1ae6..3900ddb64 (1 commit)

https://pdfium.googlesource.com/pdfium.git/+log/6b26e1ae6932..3900ddb64f30

$ git log 6b26e1ae6..3900ddb64 --date=short --no-merges --format='%ad %ae %s'
2018-04-17 thestig Add a virtual CPWL_Wnd::GetText() method.

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: Idd6d94a554ab292fea802bd28549f1e82b4a3d69
Reviewed-on: https://chromium-review.googlesource.com/1014953
Commit-Queue: pdfium-chromium-autoroll <pdfium-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Reviewed-by: pdfium-chromium-autoroll <pdfium-chromium-autoroll@skia-buildbots.google.com.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#551357}

DEPS

@@ -110,7 +110,7 @@ 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': '6b26e1ae69321717c5ce098a1cd2c9f3e1099344',
+  'pdfium_revision': '3900ddb64f30f36fd6696bd2927cf8f151e6ede9',
   # 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.