Roll src/third_party/pdfium/ cae6bdfff..43cbe9ea0 (3 commits).

https://pdfium.googlesource.com/pdfium.git/+log/cae6bdfff7e4..43cbe9ea0ff1

$ git log cae6bdfff..43cbe9ea0 --date=short --no-merges --format='%ad %ae %s'
2016-08-25 npm Remove unused methods in CPDF_TextPage and nits
2016-08-25 tonikitoo Drop CPDFSDK_PageView::Annot_HasAppearance
2016-08-25 tsepez Tidy up CFX_PathData

TBR=dsinclair@chromium.org

Review-Url: https://codereview.chromium.org/2278793004
Cr-Commit-Position: refs/heads/master@{#414464}

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': 'cae6bdfff7e409312f2f88548be5b30abfa84147',
+  'pdfium_revision': '43cbe9ea0ff1d0d8b0a7a5c84e5a96f83aec78c1',
   # 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.