Roll src/third_party/pdfium/ 5fec597c1..50034a679 (1 commit).

https://pdfium.googlesource.com/pdfium.git/+log/5fec597c1a23..50034a679249

$ git log 5fec597c1..50034a679 --date=short --no-merges --format='%ad %ae %s'
2016-08-30 dsinclair Ignore the base/trace_event directory

TBR=dsinclair@chromium.org

Review-Url: https://codereview.chromium.org/2293923002
Cr-Commit-Position: refs/heads/master@{#415310}

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': '5fec597c1a23a87b30c6ee9a45534aee91278709',
+  'pdfium_revision': '50034a679249390852ac26a4119d35fbe124300e',
   # 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.