Prepare base/ for compilation with OS X 10.7 deployment target.

base/mac/authorization_util.mm

Index: base/mac/authorization_util.mm
diff --git a/base/mac/authorization_util.mm b/base/mac/authorization_util.mm
index d09b95d800548b4849478d46a0b865c75b600ccf..a459bbf8fe4e05e4ef2de2cb748dc965b9726980 100644
--- a/base/mac/authorization_util.mm
+++ b/base/mac/authorization_util.mm
@@ -108,6 +108,9 @@ OSStatus ExecuteWithPrivilegesAndGetPID(AuthorizationRef authorization,
     pipe_pointer = &local_pipe;
   }
 
+// Deprecated in OS X 10.7. https://crbug.com/592663.
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
   // AuthorizationExecuteWithPrivileges wants |char* const*| for |arguments|,
   // but it doesn't actually modify the arguments, and that type is kind of
   // silly and callers probably aren't dealing with that.  Put the cast here
@@ -117,6 +120,7 @@ OSStatus ExecuteWithPrivilegesAndGetPID(AuthorizationRef authorization,
                                                        options,
                                                        (char* const*)arguments,
                                                        pipe_pointer);
+#pragma clang diagnostic pop
   if (status != errAuthorizationSuccess) {
     return status;
   }