Roll pdfium to get fixes for build warnings.

Roll pdfium to get fixes for build warnings.

a3f590b  Add Matt Giuca to AUTHORS.
4db62f5  Fixed or silenced all warnings and turned on warnings-as-errors.
2c4b046  cf2hints: Fix early loop termination causing hints to be ignored.
4fbe779  Add some blank lines at the end of 3 files to remove the "no newlines at end of file" warning.
6f9095f  Add my @chromium account in the AUTHORS file.
54c1825  Remove "using namespace agg" to make it clear which code is using agg, and also so we can turn compiler warnings into errors.
5ce98f5  Fix warning on Mac.
41f0590  Remove "using namespace v8" in header. This allows us to turn all warnings into errors. It also makes it clearer to find usage of v8 in the library.

R=thestig@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=271905

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272277

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=272522

[Lei Zhang, 2014-05-20 22:43:16]

lgtm

Drop the "by Foo - N minutes ago" bits from the commit msg?

[jam, 2014-05-21 15:57:14]

On 2014/05/20 22:43:16, Lei Zhang wrote:
> lgtm
> 
> Drop the "by Foo - N minutes ago" bits from the commit msg?

done