fix https://code.google.com/p/skia/issues/detail?id=1356
('32-bit Mac compiler doesn't like https://code.google.com/p/skia/source/detail?r=9686')



git-svn-id: http://skia.googlecode.com/svn/trunk@9688 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/include/core/SkString.h b/include/core/SkString.h
index 1ed2ccf..5d97533 100644
--- a/include/core/SkString.h
+++ b/include/core/SkString.h
@@ -60,9 +60,9 @@
 
 
 #define SkStrAppendU32_MaxSize  10
-char*   SkStrAppendU32(char buffer[], int32_t);
+char*   SkStrAppendU32(char buffer[], uint32_t);
 #define SkStrAppendU64_MaxSize  20
-char*   SkStrAppendU64(char buffer[], int64_t, int minDigits);
+char*   SkStrAppendU64(char buffer[], uint64_t, int minDigits);
 
 #define SkStrAppendS32_MaxSize  (SkStrAppendU32_MaxSize + 1)
 char*   SkStrAppendS32(char buffer[], int32_t);