Roll src/third_party/pdfium/ ca03f7a1c..3a0a808ff (4 commits).

https://pdfium.googlesource.com/pdfium.git/+log/ca03f7a1c654..3a0a808ff546

$ git log ca03f7a1c..3a0a808ff --date=short --no-merges --format='%ad %ae %s'
2016-10-06 kcwu Fix assertion failure when decoding malform G4 fax image
2016-10-06 kcwu Reject JBig2 Huffman table with too large shift value
2016-10-06 npm Split m_InstalledTTFonts into two vectors to avoid sketchy logic.
2016-10-06 caryclark switch to new skia blend mode enum class

BUG=653044

TBR=dsinclair@chromium.org

Review-Url: https://codereview.chromium.org/2395263002
Cr-Commit-Position: refs/heads/master@{#423683}

DEPS

@@ -63,7 +63,7 @@ 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': 'ca03f7a1c654709152a411f665ce38c3626582e8',
+  'pdfium_revision': '3a0a808ff546b5633a2384f4ed156b7ced605c90',
   # 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.