Fix compilation with SK_ENABLE_INST_COUNT=1

bench/GrResourceCacheBench.cpp

Index: bench/GrResourceCacheBench.cpp
diff --git a/bench/GrResourceCacheBench.cpp b/bench/GrResourceCacheBench.cpp
index d8e63d530a6ce41e349e00f3e5d37d83f256ade5..8eed0cd9ed3524dc6fb75a995848a696cb67c1cb 100644
--- a/bench/GrResourceCacheBench.cpp
+++ b/bench/GrResourceCacheBench.cpp
@@ -71,9 +71,6 @@ private:
     typedef GrResource INHERITED;
 };
 
-SK_DEFINE_INST_COUNT(StencilResource)
-SK_DEFINE_INST_COUNT(TextureResource)
-
 static void get_stencil(int i, int* w, int* h, int* s) {
     *w = i % 1024;
     *h = i * 2 % 1024;