[C++11 Allowed Features] Declares a type-safe null pointer converting from NULL to nullptr in src/…

cc/resources/picture_layer_tiling_set.cc

Index: cc/resources/picture_layer_tiling_set.cc
diff --git a/cc/resources/picture_layer_tiling_set.cc b/cc/resources/picture_layer_tiling_set.cc
index 1806ebc01c06b61ecdd318e2b7b1bdf793558c3b..881192638acdeeb15b9126065f949f6e0fb8a6f6 100644
--- a/cc/resources/picture_layer_tiling_set.cc
+++ b/cc/resources/picture_layer_tiling_set.cc
@@ -130,7 +130,7 @@ PictureLayerTiling* PictureLayerTilingSet::TilingAtScale(float scale) const {
     if (tilings_[i]->contents_scale() == scale)
       return tilings_[i];
   }
-  return NULL;
+  return nullptr;
 }
 
 void PictureLayerTilingSet::RemoveAllTilings() {
@@ -208,13 +208,13 @@ gfx::Size PictureLayerTilingSet::CoverageIterator::texture_size() const {
 
 Tile* PictureLayerTilingSet::CoverageIterator::operator->() const {
   if (!tiling_iter_)
-    return NULL;
+    return nullptr;
   return *tiling_iter_;
 }
 
 Tile* PictureLayerTilingSet::CoverageIterator::operator*() const {
   if (!tiling_iter_)
-    return NULL;
+    return nullptr;
   return *tiling_iter_;
 }
 
@@ -227,9 +227,9 @@ TileResolution PictureLayerTilingSet::CoverageIterator::resolution() const {
 PictureLayerTiling* PictureLayerTilingSet::CoverageIterator::CurrentTiling()
     const {
   if (current_tiling_ < 0)
-    return NULL;
+    return nullptr;
   if (static_cast<size_t>(current_tiling_) >= set_->tilings_.size())
-    return NULL;
+    return nullptr;
   return set_->tilings_[current_tiling_];
 }