Run svn propdel svn:executable on source code files.

Review URL: https://breakpad.appspot.com/934002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1263 4c0a9323-5329-0410-9bdc-e9ce6186880e
Fix warnings from the Windows build.

These warnings are fatal in my GYP-generated debug build.
The warnings can be seen on Linux/Mac with -Wshorten-64-to-32.

R=mark@chromium.org

Review URL: https://breakpad.appspot.com/944002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1264 4c0a9323-5329-0410-9bdc-e9ce6186880e