remove sprintf

src/core/SkError.cpp

Index: src/core/SkError.cpp
diff --git a/src/core/SkError.cpp b/src/core/SkError.cpp
index 9e8ff2ddef01ff3fda1f5340f7a7e0f42713a796..2c4abc65c264e949691851b49877a8c53499fded 100644
--- a/src/core/SkError.cpp
+++ b/src/core/SkError.cpp
@@ -14,6 +14,10 @@
 #include <stdio.h>
 #include <stdarg.h>
 
+#ifdef SK_BUILD_FOR_WIN
+    #define snprintf _snprintf
+#endif
+
 namespace {
     void *CreateThreadError() {
         return SkNEW_ARGS(SkError, (kNoError_SkError));
@@ -129,7 +133,7 @@ void SkErrorInternals::SetError(SkError code, const char *fmt, ...) {
             break;
     }
 
-    sprintf( str, "%s: ", error_name );
+    snprintf(str, ERROR_STRING_LENGTH, "%s: ", error_name);
     int string_left = SkToInt(ERROR_STRING_LENGTH - strlen(str));
     str += strlen(str);