Revert of Begin instanced rendering for simple shapes

src/gpu/instanced/GLInstancedRendering.h

Index: src/gpu/instanced/GLInstancedRendering.h
diff --git a/src/gpu/instanced/GLInstancedRendering.h b/src/gpu/instanced/GLInstancedRendering.h
deleted file mode 100644
index 569e6e316014b5597d0705f42e7feaa4966477ef..0000000000000000000000000000000000000000
--- a/src/gpu/instanced/GLInstancedRendering.h
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef gr_instanced_GLInstancedRendering_DEFINED
-#define gr_instanced_GLInstancedRendering_DEFINED
-
-#include "gl/GrGLBuffer.h"
-#include "instanced/InstancedRendering.h"
-
-class GrGLGpu;
-
-#define GR_GL_LOG_INSTANCED_BATCHES 0
-
-namespace gr_instanced {
-
-class GLInstancedRendering final : public InstancedRendering {
-public:
-    static GLInstancedRendering* CreateIfSupported(GrGLGpu*);
-    ~GLInstancedRendering() override;
-
-private:
-    GLInstancedRendering(GrGLGpu*, AntialiasMode lastSupportedAAMode);
-
-    GrGLGpu* glGpu() const;
-
-    Batch* createBatch() override;
-
-    void onBeginFlush(GrResourceProvider*) override;
-    void onDraw(const GrPipeline&, const InstanceProcessor&, const Batch*) override;
-    void onEndFlush() override;
-    void onResetGpuResources(ResetType) override;
-
-    void flushInstanceAttribs(int baseInstance);
-
-    struct GLDrawCmdInfo {
-        int fInstanceCount;
-#if GR_GL_LOG_INSTANCED_BATCHES
-        IndexRange fGeometry;
-#endif
-    };
-
-    GrGLuint                              fVertexArrayID;
-    SkAutoTUnref<GrGLBuffer>              fInstanceBuffer;
-    SkAutoTUnref<GrGLBuffer>              fDrawIndirectBuffer;
-    SkAutoSTMalloc<1024, GLDrawCmdInfo>   fGLDrawCmdsInfo;
-    uint32_t                              fInstanceAttribsBufferUniqueId;
-    int                                   fInstanceAttribsBaseInstance;
-
-    class GLBatch;
-
-    typedef InstancedRendering INHERITED;
-};
-
-}
-
-#endif