Switch over to the google3 unix_file File*.

I also moved macros.h to base/macros.h to ease google3 porting, at
the expense of a larger than necessary change. (I learned my lesson,
though, and didn't make the equivalent base/logging.h change.)

I'm not sure whether we want to keep the unix_file MappedFile given
our existing MemMap, but it's easier to bring it over and then remove
it (and possibly revert the removal) than to bring it over later.

Change-Id: Id50a66faa5ab17b9bc936cc9043dbc26f791f0ca
diff --git a/src/primitive.h b/src/primitive.h
index ae2e487..d0caeca 100644
--- a/src/primitive.h
+++ b/src/primitive.h
@@ -19,8 +19,8 @@
 
 #include <sys/types.h>
 
+#include "base/macros.h"
 #include "logging.h"
-#include "macros.h"
 
 namespace art {