Roll src/third_party/pdfium/ 7b68f616e..8c2a8cda1 (1 commit).

https://pdfium.googlesource.com/pdfium.git/+log/7b68f616e492..8c2a8cda1bdb

$ git log 7b68f616e..8c2a8cda1 --date=short --no-merges --format='%ad %ae %s'
2016-09-07 tsepez Fix spelling of "Formated" in several variables

TBR=dsinclair@chromium.org

Review-Url: https://codereview.chromium.org/2324693002
Cr-Commit-Position: refs/heads/master@{#417171}

DEPS

@@ -60,7 +60,7 @@ 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': '7b68f616e49235267eeac8db51aadade6d60e243',
+  'pdfium_revision': '8c2a8cda1bdb9f57513af5a21a5d0ce32614e52b',
   # 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.