move GrMalloc, GrFree, Gr_bzero to their sk equivalents

src/gpu/GrMemoryPool.cpp

Index: src/gpu/GrMemoryPool.cpp
diff --git a/src/gpu/GrMemoryPool.cpp b/src/gpu/GrMemoryPool.cpp
index 83b02bd9e58991a2b385387456b21b7f68abdd74..deb7d1a81472dde1c207feb78a131116c02e2809 100644
--- a/src/gpu/GrMemoryPool.cpp
+++ b/src/gpu/GrMemoryPool.cpp
@@ -104,7 +104,7 @@ void GrMemoryPool::release(void* p) {
 
 GrMemoryPool::BlockHeader* GrMemoryPool::CreateBlock(size_t size) {
     BlockHeader* block =
-        reinterpret_cast<BlockHeader*>(GrMalloc(size + kHeaderSize));
+        reinterpret_cast<BlockHeader*>(sk_malloc_throw(size + kHeaderSize));
     // we assume malloc gives us aligned memory
     SkASSERT(!(reinterpret_cast<intptr_t>(block) % kAlignment));
     block->fLiveCount = 0;
@@ -115,7 +115,7 @@ GrMemoryPool::BlockHeader* GrMemoryPool::CreateBlock(size_t size) {
 }
 
 void GrMemoryPool::DeleteBlock(BlockHeader* block) {
-    GrFree(block);
+    sk_free(block);
 }
 
 void GrMemoryPool::validate() {