Cleanup GrContextFactory and make it's subclasses private

include/gpu/gl/SkANGLEGLContext.h

-
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#ifndef SkANGLEGLContext_DEFINED
-#define SkANGLEGLContext_DEFINED
-
-#if SK_ANGLE
-
-#include "SkGLContext.h"
-
-#include <GLES2/gl2.h>
-#include <EGL/egl.h>
-
-class SkANGLEGLContext : public SkGLContext {
-public:
-    virtual ~SkANGLEGLContext() SK_OVERRIDE;
-    virtual void makeCurrent() const SK_OVERRIDE;
-    virtual void swapBuffers() const SK_OVERRIDE;
-
-    static SkANGLEGLContext* Create(GrGLStandard forcedGpuAPI) {
-        if (kGL_GrGLStandard == forcedGpuAPI) {
-            return NULL;
-        }
-        SkANGLEGLContext* ctx = SkNEW(SkANGLEGLContext);
-        if (!ctx->isValid()) {
-            SkDELETE(ctx);
-            return NULL;
-        }
-        return ctx;
-    }
-
-private:
-    SkANGLEGLContext();
-    void destroyGLContext();
-
-    EGLContext fContext;
-    EGLDisplay fDisplay;
-    EGLSurface fSurface;
-};
-
-#endif
-
-#endif