Revert of Begin instanced rendering for simple shapes

src/gpu/GrGpu.h

Index: src/gpu/GrGpu.h
diff --git a/src/gpu/GrGpu.h b/src/gpu/GrGpu.h
index 032edc3fc97f75e1ebe1eedb26267e43ff318dff..a733f45e3c12ef79239b64e82d00060e4cac196a 100644
--- a/src/gpu/GrGpu.h
+++ b/src/gpu/GrGpu.h
@@ -38,8 +38,6 @@
 class GrSurface;
 class GrTexture;
 
-namespace gr_instanced { class InstancedRendering; }
-
 class GrGpu : public SkRefCnt {
 public:
     /**
@@ -147,13 +145,6 @@
      */
     GrBuffer* createBuffer(size_t size, GrBufferType intendedType, GrAccessPattern accessPattern,
                            const void* data = nullptr);
-
-    /**
-     * Creates an instanced rendering object if it is supported on this platform.
-     */
-    virtual gr_instanced::InstancedRendering* createInstancedRenderingIfSupported() {
-        return nullptr;
-    }
 
     /**
      * Resolves MSAA.
@@ -588,7 +579,6 @@
     GrContext*                                                          fContext;
 
     friend class GrPathRendering;
-    friend class gr_instanced::InstancedRendering;
     typedef SkRefCnt INHERITED;
 };