Mac: Fail early on Sandbox errors
Mac: Fail early on Sandbox errors

We know that on certain machines the Seatbelt library is borked and even a simple test program that initializes the sandbox fails.

There is already a CHECK() in chrome_dll_main() that fires if the Sandbox didn't initialize correctly.  This CL changes all sandbox failures to LOG(FATAL)s so we get different stack signatures when we crash.

BUG=44761
TEST=Browser & Unit tests should continue to function correctly.

Review URL: http://codereview.chromium.org/2861046

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@52058 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

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