Fix SCons sandbox builds to parallel accumulated VS changes: * Add CHROMIUM_BUILD and _SECURE_ATL defines. * No /Wp64. * Add unload_dll_test.cc. Review URL: http://codereview.chromium.org/4224
Fix SCons sandbox builds to parallel accumulated VS changes:
* Add CHROMIUM_BUILD and _SECURE_ATL defines.
* No /Wp64.
* Add unload_dll_test.cc.
Review URL: http://codereview.chromium.org/4224

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@2505 0039d316-1c4b-4281-b951-d872f2087c98

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