Roll PDFium from deb48dadd908 to 70a0346e94a8 (7 revisions)

https://pdfium.googlesource.com/pdfium.git/+log/deb48dadd908..70a0346e94a8

2021-12-11 tsepez@chromium.org Remove CFX_WideStringBuf from cxfa_document_builder.cpp
2021-12-11 thestig@chromium.org Make CJS_Result::Error() return const-ref.
2021-12-11 tsepez@chromium.org Remove CFX_WideTextBuf operator<<() overloads for numeric types.
2021-12-11 tsepez@chromium.org Remove CFX_WideTextBuf from cfx_xmlelement.cpp
2021-12-11 david@adalogics.com Add user interaction simulation in XFA FDP fuzzer
2021-12-10 tsepez@chromium.org Avoid copy between CFX_WideTextBuf and WideString in CFX_UTF8Decoder.
2021-12-10 tsepez@chromium.org Remove reachable NOTREACHED() in CreateChildUIAndValueNodesIfNeeded().

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 file a bug in PDFium: https://bugs.chromium.org/p/pdfium/issues/entry
To file a bug in Chromium: https://bugs.chromium.org/p/chromium/issues/entry

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/main/autoroll/README.md

Bug: chromium:1276950,chromium:1278307
Tbr: pdfium-deps-rolls@chromium.org
Change-Id: Ibe0c4d64712df372dffacfcc2ed62bfee0f65e92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3332801
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Bot-Commit: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#950823}

DEPS

@@ -255,7 +255,7 @@ 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': 'deb48dadd9087b689e23e4af4ad91afeea0d33b0',
+  'pdfium_revision': '70a0346e94a8fbb0dff60e7dced773d1b0021223',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.