stdint types all the way!

Change-Id: I4e4ef3a2002fc59ebd9097087f150eaf3f2a7e08
diff --git a/runtime/image.cc b/runtime/image.cc
index f451df9..c065d8e 100644
--- a/runtime/image.cc
+++ b/runtime/image.cc
@@ -23,8 +23,8 @@
 
 namespace art {
 
-const byte ImageHeader::kImageMagic[] = { 'a', 'r', 't', '\n' };
-const byte ImageHeader::kImageVersion[] = { '0', '1', '0', '\0' };
+const uint8_t ImageHeader::kImageMagic[] = { 'a', 'r', 't', '\n' };
+const uint8_t ImageHeader::kImageVersion[] = { '0', '1', '0', '\0' };
 
 ImageHeader::ImageHeader(uint32_t image_begin,
                          uint32_t image_size,