Remove an empty file ossource_nspr.cpp

Fix ANGLE patching/building issues.

1) Remove an empty file: this causes patch apply failures when updating WebKit side ANGLE.
2) Fix a 64-to-32 conversion issue.
3) Append a change to Tokenizer.l that's left out in a previous CL. (cpp is already updated).
Committed: https://code.google.com/p/angleproject/source/detail?r=1832

[Zhenyao Mo, 2013-02-21 23:25:37]

The deleted file src/compiler/ossource_nspr.cpp does not show in the uploaded
patch.  I think it's because the file is empty.

Al: please review.

[apatrick1, 2013-02-21 23:48:40]

lgtm