mac: Update knowledge of CFAllocator internals for 10.12

base/mac/mac_util.h

Index: base/mac/mac_util.h
diff --git a/base/mac/mac_util.h b/base/mac/mac_util.h
index 6f012ad02e413dccb57ee334e92d8b567086cdc8..5d2afc2565eeaad8bdc99621627aee032220cf37 100644
--- a/base/mac/mac_util.h
+++ b/base/mac/mac_util.h
@@ -113,27 +113,33 @@ BASE_EXPORT bool RemoveQuarantineAttribute(const FilePath& file_path);
 // "OrLater" variants to those that check for a specific version, unless you
 // know for sure that you need to check for a specific version.
 
-// Mavericks is Mac OS X 10.9, Darwin 13.
+// Mavericks is OS X 10.9, Darwin 13.
 BASE_EXPORT bool IsOSMavericks();
 BASE_EXPORT bool IsOSMavericksOrLater();
 
-// Yosemite is Mac OS X 10.10, Darwin 14.
+// Yosemite is OS X 10.10, Darwin 14.
 BASE_EXPORT bool IsOSYosemite();
 BASE_EXPORT bool IsOSYosemiteOrEarlier();
 BASE_EXPORT bool IsOSYosemiteOrLater();
 
-// El Capitan is Mac OS X 10.11, Darwin 15.
+// El Capitan is OS X 10.11, Darwin 15.
 BASE_EXPORT bool IsOSElCapitan();
+BASE_EXPORT bool IsOSElCapitanOrEarlier();
 BASE_EXPORT bool IsOSElCapitanOrLater();
 
+// Sierra is macOS 10.12, Darwin 16.
+BASE_EXPORT bool IsOSSierra();
+BASE_EXPORT bool IsOSSierraOrLater();
+
 // This should be infrequently used. It only makes sense to use this to avoid
 // codepaths that are very likely to break on future (unreleased, untested,
 // unborn) OS releases, or to log when the OS is newer than any known version.
-BASE_EXPORT bool IsOSLaterThanElCapitan_DontCallThis();
+BASE_EXPORT bool IsOSLaterThanSierra_DontCallThis();
 
 // Inline functions that are redundant due to version ranges being mutually-
 // exclusive.
 inline bool IsOSYosemiteOrEarlier() { return !IsOSElCapitanOrLater(); }
+inline bool IsOSElCapitanOrEarlier() { return !IsOSSierraOrLater(); }
 
 // When the deployment target is set, the code produced cannot run on earlier
 // OS releases. That enables some of the IsOS* family to be implemented as
@@ -174,7 +180,19 @@ inline bool IsOSElCapitanOrLater() { return true; }
     MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_11
 #define BASE_MAC_MAC_UTIL_H_INLINED_GT_10_11
 inline bool IsOSElCapitan() { return false; }
-inline bool IsOSLaterThanElCapitan_DontCallThis() { return true; }
+#endif
+
+#if defined(MAC_OS_X_VERSION_10_12) && \
+    MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_12
+#define BASE_MAC_MAC_UTIL_H_INLINED_GE_10_12
+inline bool IsOSSierraOrLater() { return true; }
+#endif
+
+#if defined(MAC_OS_X_VERSION_10_12) && \
+    MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_12
+#define BASE_MAC_MAC_UTIL_H_INLINED_GT_10_12
+inline bool IsOSSierra() { return false; }
+inline bool IsOSLaterThanSierra_DontCallThis() { return true; }
 #endif
 
 // Retrieve the system's model identifier string from the IOKit registry: