Revert of Roll PDFium a2b3ae2..9ae9ae2 (patchset #1 id:1 of https://codereview.chromium.org/1311903002/ )

Reason for revert:
Broke Linux ARM compilation:

http://build.chromium.org/p/chromium.linux/builders/Linux%20ARM/builds/2733

Original issue's description:
> Roll PDFium a2b3ae2..9ae9ae2
>
> https://pdfium.googlesource.com/pdfium.git/+log/a2b3ae2..9ae9ae2
>
> [email protected]
>
> Committed: https://crrev.com/cf5641a8a24cacdfd4026a921619832855543587
> Cr-Commit-Position: refs/heads/master@{#345161}

[email protected],[email protected]
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1316493003

Cr-Commit-Position: refs/heads/master@{#345167}
diff --git a/DEPS b/DEPS
index 54556a3a..17de749 100644
--- a/DEPS
+++ b/DEPS
@@ -55,7 +55,7 @@
   # 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': '9ae9ae2a68439cbc84a719c0dacf6984703e77cb',
+  'pdfium_revision': 'a2b3ae23556fb2f1adbc008574f33bf365476af9',
   # 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.