cc::SharedQuadState: drop CopyFrom and add copy constructor

cc/test/render_pass_test_utils.cc

 // Copyright 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.
 
 #include "cc/test/render_pass_test_utils.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "cc/quads/debug_border_draw_quad.h"
@@ skipping 240 matching lines @@
                                vertex_opacity, false, false, false);
 
   TileDrawQuad* scaled_tile_quad =
       to_pass->CreateAndAppendDrawQuad<TileDrawQuad>();
   scaled_tile_quad->SetNew(shared_state, rect, opaque_rect, visible_rect,
                            resource2, gfx::RectF(0, 0, 50, 50),
                            gfx::Size(50, 50), false, false);
 
   SharedQuadState* transformed_state =
       to_pass->CreateAndAppendSharedQuadState();
-  transformed_state->CopyFrom(shared_state);
+  *transformed_state = *shared_state;
   gfx::Transform rotation;
   rotation.Rotate(45);
   transformed_state->quad_to_target_transform =
       transformed_state->quad_to_target_transform * rotation;
   TileDrawQuad* transformed_tile_quad =
       to_pass->CreateAndAppendDrawQuad<TileDrawQuad>();
   transformed_tile_quad->SetNew(
       transformed_state, rect, opaque_rect, visible_rect, resource3,
       gfx::RectF(0, 0, 100, 100), gfx::Size(100, 100), false, false);
 
@@ skipping 18 matching lines @@
       to_pass->CreateAndAppendDrawQuad<YUVVideoDrawQuad>();
   yuv_quad->SetNew(shared_state2, rect, opaque_rect, visible_rect,
                    gfx::RectF(.0f, .0f, 100.0f, 100.0f),
                    gfx::RectF(.0f, .0f, 50.0f, 50.0f), gfx::Size(100, 100),
                    gfx::Size(50, 50), plane_resources[0], plane_resources[1],
                    plane_resources[2], plane_resources[3], color_space, 0.0,
                    1.0);
 }
 
 }  // namespace cc