Switch to standard integer types in cryptohome.h.

BUG=138542
TBR=derat@chromium.org

Change-Id: Ie240ae546bd09f12ffdeffa0c38ca97381daeabe
Reviewed-on: https://chromium-review.googlesource.com/320000
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Tested-by: Avi Drissman <avi@chromium.org>
diff --git a/constants/cryptohome.h b/constants/cryptohome.h
index 7c5c512..8238aa9 100644
--- a/constants/cryptohome.h
+++ b/constants/cryptohome.h
@@ -5,10 +5,12 @@
 #ifndef CONSTANTS_CRYPTOHOME_H_
 #define CONSTANTS_CRYPTOHOME_H_
 
+#include <stdint.h>
+
 namespace cryptohome {
 
 // Cleanup is trigerred if the amount of free disk space goes below this value.
-const int64 kMinFreeSpaceInBytes = 512 * 1LL << 20;
+const int64_t kMinFreeSpaceInBytes = 512 * 1LL << 20;
 
 }  // namespace cryptohome