Roll PDFium to f33cdd5

Roll PDFium to f33cdd5

f33cdd5  Make CFX_StringData be scoped
8b2d91c  Fix integer overflow in conversion from float to integer.
1b8a296  Use phantom handles instead of weak handles
8aa1eac  Tidy public/ directory.
fdc5e69  Fix comparison of CFX_ByteString and CFX_WideString against empty literals.
2a47d8d  Set pointers in internal fields directly instead of wrapping them
b2aa543  Make (and verify) public/ files compile under C.
e6bd866  Describe required properties of public/ files with a README.
feb10c5  Restore checked strlen conversions.

Also makes a corresponding change to pdfium_engine.cc to match a changed
pdfium API.

Committed: https://crrev.com/62995cf3e960ca14e7a68ce9c4ccdf4d87a697b7
Cr-Commit-Position: refs/heads/master@{#330044}

[Tom Sepez, 2015-05-15 00:55:25]

tsepez@chromium.org changed reviewers:
+ thestig@chromium.org

[Tom Sepez, 2015-05-15 00:55:47]

Taking over from https://codereview.chromium.org/1141143002/

[jochen (gone - plz use gerrit), 2015-05-15 00:55:54]

jochen@chromium.org changed reviewers:
+ jochen@chromium.org

[jochen (gone - plz use gerrit), 2015-05-15 00:55:55]

lgtm

[Lei Zhang, 2015-05-15 04:53:19]

The CQ bit was checked by thestig@chromium.org

[Lei Zhang, 2015-05-15 04:53:20]

lgtm

[commit-bot: I haz the power, 2015-05-15 04:53:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1132293005/20001

[commit-bot: I haz the power, 2015-05-15 04:57:45]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-15 05:00:30]

Patchset 2 (id:??) landed as
https://crrev.com/62995cf3e960ca14e7a68ce9c4ccdf4d87a697b7
Cr-Commit-Position: refs/heads/master@{#330044}