Fixing pepper::FileIO::GetOSFileDescriptor(): 1. Return the actual file descriptor. 2. int cannot be converted to uintptr_t on Linux and Mac (and we don't need to do this).
Fixing pepper::FileIO::GetOSFileDescriptor():
1. Return the actual file descriptor.
2. int cannot be converted to uintptr_t on Linux and Mac (and we don't
need to do this).

Might have to come up with a better solution for the
base::PlatformFile --> int32_t conversion, but this should do for now,
to fix the build.

TEST=none
BUG=none
TBR=darin

Review URL: http://codereview.chromium.org/3293017

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@59046 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser