move GrMalloc, GrFree, Gr_bzero to their sk equivalents

BUG=
R=bsalomon@google.com

Review URL: https://codereview.chromium.org/23566022

git-svn-id: http://skia.googlecode.com/svn/trunk@11486 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrRectanizer.cpp b/src/gpu/GrRectanizer.cpp
index 6f4b49e..7b49530 100644
--- a/src/gpu/GrRectanizer.cpp
+++ b/src/gpu/GrRectanizer.cpp
@@ -18,7 +18,7 @@
     GrRectanizerPow2(int w, int h) : GrRectanizer(w, h) {
         fNextStripY = 0;
         fAreaSoFar = 0;
-        Gr_bzero(fRows, sizeof(fRows));
+        sk_bzero(fRows, sizeof(fRows));
     }
 
     virtual ~GrRectanizerPow2() {