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/stack.h b/src/stack.h
index ecfa846..30de26d 100644
--- a/src/stack.h
+++ b/src/stack.h
@@ -17,11 +17,11 @@
 #ifndef ART_SRC_STACK_H_
 #define ART_SRC_STACK_H_
 
+#include "base/macros.h"
 #include "dex_file.h"
 #include "heap.h"
 #include "instrumentation.h"
 #include "jni.h"
-#include "macros.h"
 #include "oat/runtime/context.h"
 
 #include <stdint.h>