Remove ~GrIORef since last remaining virtual and now all inline

src/gpu/GrGpuResource.cpp

Index: src/gpu/GrGpuResource.cpp
diff --git a/src/gpu/GrGpuResource.cpp b/src/gpu/GrGpuResource.cpp
index 5452184793eab9c01f98f3ed1cf907d1b7203897..8473dd8d4273bfb7418c209d26bf210ac425bef9 100644
--- a/src/gpu/GrGpuResource.cpp
+++ b/src/gpu/GrGpuResource.cpp
@@ -11,16 +11,6 @@
 #include "GrResourceCache2.h"
 #include "GrGpu.h"
 
-template<typename D> GrIORef<D>::~GrIORef() {
-    SkASSERT(0 == fRefCnt);
-    SkASSERT(0 == fPendingReads);
-    SkASSERT(0 == fPendingWrites);
-    // Set to invalid values.
-    SkDEBUGCODE(fRefCnt = fPendingReads = fPendingWrites = -10;)
-}
-
-///////////////////////////////////////////////////////////////////////////////
-
 static inline GrResourceCache2* get_resource_cache2(GrGpu* gpu) {
     SkASSERT(gpu);
     SkASSERT(gpu->getContext());