move GrMalloc, GrFree, Gr_bzero to their sk equivalents

include/gpu/GrTypes.h

Index: include/gpu/GrTypes.h
diff --git a/include/gpu/GrTypes.h b/include/gpu/GrTypes.h
index b78976361b4dfdd76d550ab270357ffdf39c5fba..0585074697906bde9dd08d3158352546bbcd8e15 100644
--- a/include/gpu/GrTypes.h
+++ b/include/gpu/GrTypes.h
@@ -125,16 +125,6 @@ static inline size_t GrSizeAlignDown(size_t x, uint32_t alignment) {
  */
 #define GR_ARRAY_COUNT(array)  SK_ARRAY_COUNT(array)
 
-//!< allocate a block of memory, will never return NULL
-extern void* GrMalloc(size_t bytes);
-
-//!< free block allocated by GrMalloc. ptr may be NULL
-extern void GrFree(void* ptr);
-
-static inline void Gr_bzero(void* dst, size_t size) {
-    memset(dst, 0, size);
-}
-
 ///////////////////////////////////////////////////////////////////////////////
 
 /**