Revert of Improve usage of window rectangles

src/gpu/GrRenderTarget.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrRenderTarget.h"
 
@@ skipping 109 matching lines @@
 }
 
 int GrRenderTargetPriv::numStencilBits() const {
     return fRenderTarget->fStencilAttachment ? fRenderTarget->fStencilAttachment->bits() : 0;
 }
 
 const GrGpu::MultisampleSpecs&
 GrRenderTargetPriv::getMultisampleSpecs(const GrStencilSettings& stencil) const {
     return fRenderTarget->getGpu()->getMultisampleSpecs(fRenderTarget, stencil);
 }
-
-int GrRenderTargetPriv::maxWindowRectangles() const {
-    return (this->flags() & Flags::kWindowRectsSupport) ?
-           fRenderTarget->getGpu()->caps()->maxWindowRectangles() : 0;
-}