Replaced is_null() with is_valid in SurfaceId and related classes.

ui/compositor/layer.cc

 // 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.
 
 #include "ui/compositor/layer.h"
 
 #include <algorithm>
 #include <memory>
 #include <utility>
 
@@ skipping 163 matching lines @@
 
   // Filters.
   clone->SetLayerSaturation(layer_saturation_);
   clone->SetLayerBrightness(GetTargetBrightness());
   clone->SetLayerGrayscale(GetTargetGrayscale());
   clone->SetLayerInverted(layer_inverted_);
   if (alpha_shape_)
     clone->SetAlphaShape(base::MakeUnique<SkRegion>(*alpha_shape_));
 
   // cc::Layer state.
-  if (surface_layer_ && !surface_layer_->surface_id().is_null()) {
+  if (surface_layer_ && surface_layer_->surface_id().is_valid()) {
     clone->SetShowSurface(
         surface_layer_->surface_id(),
         surface_layer_->satisfy_callback(),
         surface_layer_->require_callback(),
         surface_layer_->surface_size(),
         surface_layer_->surface_scale(),
         frame_size_in_dip_);
   } else if (type_ == LAYER_SOLID_COLOR) {
     clone->SetColor(GetTargetColor());
   }
@@ skipping 980 matching lines @@
   const auto it = std::find_if(mirrors_.begin(), mirrors_.end(),
       [mirror](const std::unique_ptr<LayerMirror>& mirror_ptr) {
         return mirror_ptr.get() == mirror;
       });
 
   DCHECK(it != mirrors_.end());
   mirrors_.erase(it);
 }
 
 }  // namespace ui