Fix horrible issue with python + windows + long relative paths.
Fix horrible issue with python + windows + long relative paths.

We ran into this issue with os.path.abspath() (and open())
on windows python: http://bugs.python.org/issue4071.  This
fix works around the problem by abolsutising path names
before before using them in python file operations.

BUG=

Review URL: https://codereview.chromium.org/11360073

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@10206 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client