Reland: Remove DCHECK_IMPLIES/CHECK_IMPLIES.

cc/trees/property_tree_builder.cc

 // Copyright 2014 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/property_tree_builder.h"
 
 #include <map>
 #include <set>
 
 #include "cc/base/math_util.h"
@@ skipping 218 matching lines @@
   const bool has_any_transform_animation =
       layer->HasAnyAnimationTargetingProperty(Animation::TRANSFORM);
 
   const bool has_surface = layer->has_render_surface();
 
   bool requires_node = is_root || is_scrollable || has_significant_transform ||
                        has_any_transform_animation || has_surface || is_fixed ||
                        is_page_scale_layer;
 
   LayerType* transform_parent = GetTransformParent(data_from_ancestor, layer);
-  DCHECK_IMPLIES(!is_root, transform_parent);
+  DCHECK(is_root || transform_parent);
 
   int parent_index = kRootPropertyTreeNodeId;
   if (transform_parent)
     parent_index = transform_parent->transform_tree_index();
 
   int source_index = parent_index;
 
   gfx::Vector2dF source_offset;
   if (transform_parent) {
     if (layer->scroll_parent()) {
@@ skipping 363 matching lines @@
     const gfx::Rect& viewport,
     const gfx::Transform& device_transform,
     PropertyTrees* property_trees) {
   BuildPropertyTreesTopLevelInternal(
       root_layer, page_scale_layer, inner_viewport_scroll_layer,
       outer_viewport_scroll_layer, page_scale_factor, device_scale_factor,
       viewport, device_transform, property_trees);
 }
 
 }  // namespace cc