Roll src/third_party/pdfium ea5411d97d90..b2cb4336f2e5 (3 commits)

https://pdfium.googlesource.com/pdfium.git/+log/ea5411d97d90..b2cb4336f2e5

git log ea5411d97d90..b2cb4336f2e5 --date=short --first-parent --format='%ad %ae %s'
2019-12-13 thestig@chromium.org Fix some nits in win32 fxge code.
2019-12-13 thestig@chromium.org Initialize more member variables in the header.
2019-12-13 thestig@chromium.org Add ParseSwitchKeyValue() to pdfium_test.cc.

Created with:
  gclient setdep -r src/third_party/pdfium@b2cb4336f2e5

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/pdfium-autoroll
Please CC pdfium-deps-rolls@chromium.org on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

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

Bug: None
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: Ia9c2bd1f8ceda3a310d558056f09b4e54a503105
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1967775Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#724810}

DEPS

@@ -195,7 +195,7 @@ 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': 'ea5411d97d90d8d72f576a1cd29dd07a639e4fff',
+  'pdfium_revision': 'b2cb4336f2e5594eb9656956687fa819f6b70c37',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.