Removed gfx::QuadF::operator =(const gfx::QuadF&) and let the compiler generate one

ui/gfx/quad_f.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef UI_GFX_QUAD_F_H_
 #define UI_GFX_QUAD_F_H_
 
 #include <string>
 
 #include "ui/base/ui_export.h"
@@ skipping 12 matching lines @@
         p2_(p2),
         p3_(p3),
         p4_(p4) {}
 
   explicit QuadF(const RectF& rect)
       : p1_(rect.x(), rect.y()),
         p2_(rect.right(), rect.y()),
         p3_(rect.right(), rect.bottom()),
         p4_(rect.x(), rect.bottom()) {}
 
-  void operator=(const QuadF& quad);
   void operator=(const RectF& rect);
 
   void set_p1(const PointF& p) { p1_ = p; }
   void set_p2(const PointF& p) { p2_ = p; }
   void set_p3(const PointF& p) { p3_ = p; }
   void set_p4(const PointF& p) { p4_ = p; }
 
   const PointF& p1() const { return p1_; }
   const PointF& p2() const { return p2_; }
   const PointF& p3() const { return p3_; }
@@ skipping 49 matching lines @@
 
 // Add a vector to a quad, offseting each point in the quad by the vector.
 UI_EXPORT QuadF operator+(const QuadF& lhs, const Vector2dF& rhs);
 // Subtract a vector from a quad, offseting each point in the quad by the
 // inverse of the vector.
 UI_EXPORT QuadF operator-(const QuadF& lhs, const Vector2dF& rhs);
 
 }  // namespace gfx
 
 #endif  // UI_GFX_QUAD_F_H_