Roll src/third_party/pdfium/ 26cb2fa42..9c6b37c46 (6 commits)

https://pdfium.googlesource.com/pdfium.git/+log/26cb2fa42b1a..9c6b37c469e3

$ git log 26cb2fa42..9c6b37c46 --date=short --no-merges --format='%ad %ae %s'
2017-05-31 tsepez Rename FXJPEG_Context and use unowned ptr
2017-05-31 tsepez Put all CCodec_PngModule state into its context.
2017-05-31 tsepez Move all of ccodec_bmpmodule state to its context
2017-05-31 wileyrr Add missing public APIs to API test.
2017-05-30 tsepez CFXJS_Engine::GetObjDefnID is a static method
2017-05-30 tsepez Fix OnDestroy method for scroll bars

Created with:
  roll-dep src/third_party/pdfium


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

If the roll is causing failures, see:
http://www.chromium.org/developers/tree-sheriffs/sheriff-details-chromium#TOC-Failures-due-to-DEPS-rolls


TBR=dsinclair@chromium.org

Change-Id: Iccda0225162fbae4d6e5224639c59e64908e736b
Reviewed-on: https://chromium-review.googlesource.com/520568
Reviewed-by: <pdfium-deps-roller@chromium.org>
Commit-Queue: <pdfium-deps-roller@chromium.org>
Cr-Commit-Position: refs/heads/master@{#476183}

DEPS

@@ -64,7 +64,7 @@ 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': '26cb2fa42b1a90146f9ab5c0b83ee8b48703baf4',
+  'pdfium_revision': '9c6b37c469e3f03abc7828d44b99d1d0b4a3259b',
   # 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.