Revert of Add transfer buffer support.

src/gpu/gl/GrGLTransferBuffer.h

Index: src/gpu/gl/GrGLTransferBuffer.h
diff --git a/src/gpu/gl/GrGLTransferBuffer.h b/src/gpu/gl/GrGLTransferBuffer.h
deleted file mode 100755
index ff9caeea7454270195d504f47a8d855c43992037..0000000000000000000000000000000000000000
--- a/src/gpu/gl/GrGLTransferBuffer.h
+++ /dev/null
@@ -1,47 +0,0 @@
-/*
- * Copyright 2015 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#ifndef GrGLTransferBuffer_DEFINED
-#define GrGLTransferBuffer_DEFINED
-
-#include "GrTransferBuffer.h"
-#include "GrGLBufferImpl.h"
-#include "gl/GrGLInterface.h"
-
-class GrGLGpu;
-
-class GrGLTransferBuffer : public GrTransferBuffer {
-
-public:
-    typedef GrGLBufferImpl::Desc Desc;
-
-    GrGLTransferBuffer(GrGLGpu* gpu, const Desc& desc, GrGLenum type);
-
-    GrGLuint bufferID() const { return fImpl.bufferID(); }
-    size_t baseOffset() const { return fImpl.baseOffset(); }
-
-protected:
-    void onAbandon() override;
-    void onRelease() override;
-    void setMemoryBacking(SkTraceMemoryDump* traceMemoryDump,
-                          const SkString& dumpName) const override;
-
-private:
-    void* onMap() override;
-    void onUnmap() override;
-
-    GrGLGpu* getGpuGL() const {
-        SkASSERT(!this->wasDestroyed());
-        return (GrGLGpu*)(this->getGpu());
-    }
-
-    GrGLBufferImpl fImpl;
-
-    typedef GrTransferBuffer INHERITED;
-};
-
-#endif