remove dead code not mentioned in any GYP

src/gpu/GrCommandBuilder.h

-/*
- * 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 GrCommandBuilder_DEFINED
-#define GrCommandBuilder_DEFINED
-
-#include "GrTargetCommands.h"
-
-class GrGpu;
-class GrResourceProvider;
-class GrBufferedDrawTarget;
-
-class GrCommandBuilder : ::SkNoncopyable {
-public:
-    typedef GrTargetCommands::Cmd               Cmd;
-
-    static GrCommandBuilder* Create(GrGpu* gpu, bool reorder);
-
-    virtual ~GrCommandBuilder() {}
-
-    void reset() { fCommands.reset(); }
-    void flush(GrGpu* gpu, GrResourceProvider* rp) { fCommands.flush(gpu, rp); }
-
-    virtual Cmd* recordDrawBatch(GrBatch*, const GrCaps&) = 0;
-
-protected:
-    typedef GrTargetCommands::DrawBatch DrawBatch;
-
-    GrCommandBuilder() {}
-
-    GrTargetCommands::CmdBuffer* cmdBuffer() { return fCommands.cmdBuffer(); }
-private:
-    GrTargetCommands fCommands;
-
-};
-
-#endif