Remove unused render target members from GL and VK sk_app::WindowContext classes

tools/viewer/sk_app/GLWindowContext.h

 
 /*
  * 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 GLWindowContext_DEFINED
 #define GLWindowContext_DEFINED
 
 
 #include "gl/GrGLInterface.h"
 
 #include "SkRefCnt.h"
-#include "GrRenderTarget.h"
 #include "SkSurface.h"
 
 #include "WindowContext.h"
 
 class GrContext;
 
 namespace sk_app {
 
 class GLWindowContext : public WindowContext {
 public:
@@ skipping 19 matching lines @@
 
     // This should be called by subclass destructor. It is also called when window/display
     // parameters change prior to initializing a new GL context. This will in turn call
     // onDestroyContext().
     void destroyContext();
     virtual void onDestroyContext() = 0;
 
     virtual void onSwapBuffers() = 0;
 
     SkAutoTUnref<const GrGLInterface> fBackendContext;
-    sk_sp<GrRenderTarget>             fRenderTarget;
     sk_sp<SkSurface>                  fSurface;
 
     // parameters obtained from the native window
     // Note that the platform .cpp file is responsible for
     // initializing fSampleCount, fStencilBits, and fColorBits!
     int                               fSampleCount;
     int                               fStencilBits;
     int                               fColorBits;
     int                               fActualColorBits;
 };
 
 }   // namespace sk_app
 
 #endif