use malloc/calloc/free instead of moz_malloc/moz_calloc/moz_free in ports/SkMemory_mozalloc.cpp

BUG=skia:4560

Review URL: https://codereview.chromium.org/1449093002
diff --git a/AUTHORS b/AUTHORS
index 47f675b..4b3c09e 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -23,6 +23,7 @@
 Ion Rosca <rosca@adobe.com>
 Jacek Caban <cjacek@gmail.com>
 Jeff Muizelaar <jmuizelaar@mozilla.com>
+Lee Salzman <lsalzman@mozilla.com>
 MIPS <*@imgtec.com>
 NVIDIA <*@nvidia.com>
 Opera Software ASA <*@opera.com>