Roll src/third_party/pdfium/ 996c93068..b71d24c1a (8 commits)

https://pdfium.googlesource.com/pdfium.git/+log/996c93068bfc..b71d24c1affe

$ git log 996c93068..b71d24c1a --date=short --no-merges --format='%ad %ae %s'
2018-04-13 thestig Patch lcms to mark data structures as const.
2018-04-13 npm Fix integer overflow in CPDF_Font::FallbackFontFromCharcode
2018-04-13 hnakashima Add test for circular CPDF_Function::Load().
2018-04-13 thestig Add CPDF_ColorState::SetPattern().
2018-04-13 thestig Get rid of CPDF_Color::GetColorSpace().
2018-04-13 dsinclair Add CPDF_Metadata unittests
2018-04-13 dsinclair Hide XML parsing inside CXFA_XMLLocale
2018-04-13 dsinclair Move SharedForm check to CPDF_Metadata class

Created with:
  roll-dep src/third_party/pdfium
BUG=chromium:831583,chromium:830221


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: I5cd3fc28ca70459b9d57cf025cd02fba8e5d81cc
Reviewed-on: https://chromium-review.googlesource.com/1013045
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@{#550775}

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': '996c93068bfc8b443c77b735bc6400285bc8a407',
+  'pdfium_revision': 'b71d24c1affe8648963ba5024b62e5dbf4479ae2',
   # 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.