Roll PDFium from 9e1fc05ef7a2 to df34e3c37407 (12 revisions)

https://pdfium.googlesource.com/pdfium.git/+log/9e1fc05ef7a2..df34e3c37407

2020-07-25 tsepez@chromium.org Make ownership of XML document slightly saner.
2020-07-24 tsepez@chromium.org Rename CFXA_DocumentParser to CXFA_DocumentBuilder.
2020-07-24 tsepez@chromium.org Make an XML-tree be the input to CFXA_DocumentParser().
2020-07-24 tsepez@chromium.org Retain layout items rather than raw widgets in CFXA_TabParam.
2020-07-24 tsepez@chromium.org Make CPDFXFA_Context::m_DocEnv into a pointer.
2020-07-24 tsepez@chromium.org Simplify ~CPDFXFA_Context(), part 2
2020-07-24 tsepez@chromium.org Slightly simplify ~CPDFXFA_Context().
2020-07-24 thestig@chromium.org Fix issue with FPDFText_GetLooseCharBox() and the tranformation matrix.
2020-07-24 thestig@chromium.org Add experimental APIs to get XFA data.
2020-07-23 tsepez@chromium.org Move fxv8_unittests.{cpp,h} and fxgc_unittests.{cpp,h} to testing/
2020-07-22 tsepez@chromium.org Make test environment setup consistent with gtest model.
2020-07-22 tsepez@chromium.org Move class EmbedderTestEnvironment to standalone V8TestEnvironment.

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/+doc/master/autoroll/README.md

Bug: chromium:1109108
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: I58d04da158120610f2cc3dbc3c36eec5a169c806
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2318966Reviewed-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@{#791452}

DEPS

@@ -215,7 +215,7 @@ 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': '9e1fc05ef7a247c6b3810c4ed20e5d17742020f2',
+  'pdfium_revision': 'df34e3c37407321369e09837155862c0068c3cd7',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.