Delete IsAtLeastOS10_9() and IsAtMostOS10_9()

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 d0173c03cdc941b9352df0f2453491b54c2f823c..62f31305b3a32f0f0db0956f6a741369b702c8d3 100644
--- a/base/mac/mac_util.h
+++ b/base/mac/mac_util.h
@@ -139,7 +139,6 @@ BASE_EXPORT int MacOSXMinorVersion();
     return RET;
 #define IGNORE_DEPLOYMENT_TARGET(OP, V, RET)
 
-DEFINE_IS_OS_FUNCS(9, TEST_DEPLOYMENT_TARGET)
 DEFINE_IS_OS_FUNCS(10, TEST_DEPLOYMENT_TARGET)
 
 #ifdef MAC_OS_X_VERSION_10_11
@@ -154,6 +153,12 @@ DEFINE_IS_OS_FUNCS(12, TEST_DEPLOYMENT_TARGET)
 DEFINE_IS_OS_FUNCS(12, IGNORE_DEPLOYMENT_TARGET)
 #endif
 
+// Straggler for the oldest OS version we support.
+inline bool IsOS10_9() {
+  TEST_DEPLOYMENT_TARGET(>, 9, false)
+  return internal::MacOSXMinorVersion() == 9;
+}
+
 #undef IGNORE_DEPLOYMENT_TARGET
 #undef TEST_DEPLOYMENT_TARGET
 #undef DEFINE_IS_OS_FUNCS