[LayoutNG] Remove the ng_layout_coordinator and temporary LayoutSync method.

third_party/WebKit/Source/core/layout/ng/ng_layout_algorithm.h

Index: third_party/WebKit/Source/core/layout/ng/ng_layout_algorithm.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_layout_algorithm.h b/third_party/WebKit/Source/core/layout/ng/ng_layout_algorithm.h
index 510d833fdd73734fa1ee32305289c1f2ffe01f03..3c83e0858f6f5471b60f8f2b92f532d55a65387f 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_layout_algorithm.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_layout_algorithm.h
@@ -13,7 +13,6 @@
 namespace blink {
 
 struct MinAndMaxContentSizes;
-class NGBlockNode;
 class NGConstraintSpace;
 class NGPhysicalFragment;
 
@@ -38,16 +37,8 @@ class CORE_EXPORT NGLayoutAlgorithm
   // Actual layout function. Lays out the children and descendents within the
   // constraints given by the NGConstraintSpace. Returns a fragment with the
   // resulting layout information.
-  // This function can not be const because for interruptible layout, we have
-  // to be able to store state information.
-  // If this function returns NotFinished, it has to be called again.
-  // If it returns ChildAlgorithmRequired, the NGBlockNode out parameter will
-  // be set with the NGBlockNode that needs to be layed out next.
-  // If it returns NewFragment, the NGPhysicalFragmentBase out parameter
-  // will contain the new fragment.
-  virtual NGLayoutStatus Layout(NGPhysicalFragment*,
-                                NGPhysicalFragment**,
-                                NGLayoutAlgorithm**) = 0;
+  // TODO(layout-dev): attempt to make this function const.
+  virtual NGPhysicalFragment* Layout() = 0;
 
   enum MinAndMaxState { kSuccess, kPending, kNotImplemented };