Use a more specific type, mach_exception_code_t, when possible

Use a more specific type, mach_exception_code_t, when possible.

mach_exception_data_type_t is more generic and is used for any element
of a codes[] array. For individual elements, the typedefs
mach_exception_code_t and mach_exception_subcode_t are available. Using
mach_exception_code_t when possible gives slightly more descriptive
code.

No functional change.

TEST=util_test ExcServerVariants.*
R=rsesek@chromium.org

Committed: https://chromium.googlesource.com/crashpad/crashpad/+/021c93c2e06882958d1b3feb2c8fc1bd6ffda8f2

[Mark Mentovai, 2014-09-18 14:16:05]

mark@chromium.org changed reviewers:
+ rsesek@chromium.org

[Robert Sesek, 2014-09-18 14:50:26]

LGTM

[Mark Mentovai, 2014-09-18 15:56:13]

Committed patchset #1 (id:1) manually as 021c93c (presubmit successful).