Revert of Improve usage of window rectangles

src/gpu/GrScissorState.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 GrScissorState_DEFINED
-#define GrScissorState_DEFINED
-
-#include "SkRect.h"
-
-class GrScissorState {
-public:
-    GrScissorState() : fEnabled(false) {}
-    GrScissorState(const SkIRect& rect) : fEnabled(true), fRect(rect) {}
-    void setDisabled() { fEnabled = false; }
-    void set(const SkIRect& rect) { fRect = rect; fEnabled = true; }
-    bool SK_WARN_UNUSED_RESULT intersect(const SkIRect& rect) {
-        if (!fEnabled) {
-            this->set(rect);
-            return true;
-        }
-        return fRect.intersect(rect);
-    }
-    bool operator==(const GrScissorState& other) const {
-        return fEnabled == other.fEnabled &&
-                (false == fEnabled || fRect == other.fRect);
-    }
-    bool operator!=(const GrScissorState& other) const { return !(*this == other); }
-
-    bool enabled() const { return fEnabled; }
-    const SkIRect& rect() const { return fRect; }
-
-private:
-    bool    fEnabled;
-    SkIRect fRect;
-};
-
-#endif