Remove LayerTreeImpl::SetRootLayerFromLayerListForTesting.

cc/trees/layer_tree_host_impl_unittest.cc

 // Copyright 2011 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/trees/layer_tree_host_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 9626 matching lines @@
   bool update_lcd_text = false;
 
   // Set up active and pending tree.
   host_impl_->CreatePendingTree();
   host_impl_->pending_tree()->SetRootLayerForTesting(
       LayerImpl::Create(host_impl_->pending_tree(), 1));
   host_impl_->pending_tree()->BuildPropertyTreesForTesting();
   host_impl_->pending_tree()->UpdateDrawProperties(update_lcd_text);
 
   host_impl_->ActivateSyncTree();
-  host_impl_->active_tree()->SetRootLayerFromLayerListForTesting();
   host_impl_->active_tree()->BuildPropertyTreesForTesting();
   host_impl_->active_tree()->UpdateDrawProperties(update_lcd_text);
 
   host_impl_->CreatePendingTree();
   host_impl_->pending_tree()->UpdateDrawProperties(update_lcd_text);
   host_impl_->active_tree()->UpdateDrawProperties(update_lcd_text);
 
   EXPECT_FALSE(host_impl_->pending_tree()->needs_update_draw_properties());
   EXPECT_FALSE(host_impl_->active_tree()->needs_update_draw_properties());
 
@@ skipping 1131 matching lines @@
 
 TEST_F(LayerTreeHostImplTest, UpdatePageScaleFactorOnActiveTree) {
   // Check page scale factor update in property trees when an update is made
   // on the active tree.
   host_impl_->CreatePendingTree();
   host_impl_->pending_tree()->PushPageScaleFromMainThread(1.f, 1.f, 3.f);
   CreateScrollAndContentsLayers(host_impl_->pending_tree(),
                                 gfx::Size(100, 100));
   host_impl_->pending_tree()->BuildPropertyTreesForTesting();
   host_impl_->ActivateSyncTree();
-  host_impl_->active_tree()->SetRootLayerFromLayerListForTesting();
   DrawFrame();
 
   host_impl_->CreatePendingTree();
   host_impl_->active_tree()->SetPageScaleOnActiveTree(2.f);
   LayerImpl* page_scale_layer = host_impl_->active_tree()->PageScaleLayer();
 
   TransformNode* active_tree_node =
       host_impl_->active_tree()->property_trees()->transform_tree.Node(
           page_scale_layer->transform_tree_index());
   // SetPageScaleOnActiveTree also updates the factors in property trees.
@@ skipping 141 matching lines @@
 
   // Re-initialize with a software output surface.
   output_surface_ = FakeOutputSurface::CreateSoftware(
       base::WrapUnique(new SoftwareOutputDevice));
   host_impl_->InitializeRenderer(output_surface_.get());
   EXPECT_FALSE(host_impl_->use_gpu_rasterization());
 }
 
 }  // namespace
 }  // namespace cc