Improve and unify Mac OS X run-time version checks

third_party/apple_apsl/README.chromium

 Name: Darwin
 URL: http://www.opensource.apple.com/
 Version: unknown
 Security Critical: yes
 
 Four files are excerpted here:
 
 malloc.h from:
 http://www.opensource.apple.com/source/Libc/Libc-583/include/malloc/malloc.h
 
@@ skipping 13 matching lines @@
 
 CFBase.h from:
 http://opensource.apple.com/source/CF/CF-550/CFBase.c
 
 Modifications:
 - Renamed the file to CFBase.h.
 - Added #ifdef guards.
 - Added an #include of the CFRuntime.h file.
 - Removed everything but the definition of __CFAllocator.
 - Modified the reference of CFRuntimeBase to ChromeCFRuntimeBase.
-- Renamed __CFAllocator to ChromeCFAllocator9and10 to avoid possible name
+- Renamed __CFAllocator to ChromeCFAllocatorLeopards to avoid possible name
   conflicts.
-- Added a presumed definition of ChromeCFAllocator11.
+- Added a presumed definition of ChromeCFAllocatorLion.
 
 cssmapplePriv.h from:
 http://www.opensource.apple.com/source/libsecurity_cssm/libsecurity_cssm-31536/lib/cssmapplePriv.h
 
 Warning: Technically, this is a private Apple header, and as such provides no
 guarantee for API stability. However, the use of this header is the only way
 to implement OCSP checking per Apple's public documentation on the usage of
 their Trust Policy Module. Further, the use of this private header is the
 recommended approach from Apple for modifying OCSP policies.
 
 See: http://developer.apple.com/documentation/Security/Reference/SecAppleTrustPolicyModuleSpec/Apple_Trust_Policy_Module_Functional_Specification.pdf
 and http://lists.apple.com/archives/apple-cdsa/2008/Aug/msg00008.html
 
 Modifications:
 - Removed unneeded definitions for internal Apple CSP DL enums and structs