[LayoutNG] Fixes small crash inside preferred widths.

third_party/WebKit/Source/core/layout/ng/ng_block_node.cc

Index: third_party/WebKit/Source/core/layout/ng/ng_block_node.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_block_node.cc b/third_party/WebKit/Source/core/layout/ng/ng_block_node.cc
index 8af4036ef3099fc23e31ffdf24e380de270ef556..f0f2bcd7966ceead00d42f09030b3b7d0c44b32b 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_block_node.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_block_node.cc
@@ -228,8 +228,9 @@ bool NGBlockNode::CanUseNewLayout() const {
   if (Style().SpecifiesColumns())
     return false;
 
-  if (!box_->IsLayoutBlockFlow())
+  if (!box_->IsLayoutNGBlockFlow())
     return false;
+
   return RuntimeEnabledFeatures::LayoutNGEnabled();

[cbiesinger, 2017/06/15 17:37:57]

Do we need this or can it be return true;?

[ikilpatrick, 2017/06/15 18:05:33]

It can be true at the moment, but want to leave this in as we'll need to for if
we do:

LayoutListItem : public LayoutNGBlockFlow { }

(and LayoutNGBlockFlow has a bunch of:
LayoutNGBlockFlow::Foo() {
  if (!RuntimeEnabledFeatures::LayoutNGEnabled())
    LayoutBlockFlow::Foo();
}

 }