Revert of Add support of leader_point in NGLayoutOpportunityIterator.

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

Index: third_party/WebKit/Source/core/layout/ng/ng_units.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_units.h b/third_party/WebKit/Source/core/layout/ng/ng_units.h
index 0e77706516e6eb7759927c2f8006906ef8d32057..a8821b681b375806a0ef20feabbf198bb4e12e36 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_units.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_units.h
@@ -27,10 +27,6 @@
 
   NGPhysicalSize ConvertToPhysical(NGWritingMode mode) const;
   bool operator==(const NGLogicalSize& other) const;
-
-  bool IsEmpty() const {
-    return inline_size == LayoutUnit() || block_size == LayoutUnit();
-  }
 };
 
 // NGLogicalOffset is the position of a rect (typically a fragment) relative to
@@ -57,20 +53,7 @@
   NGLogicalOffset operator+(const NGLogicalOffset& other) const;
 
   NGLogicalOffset& operator+=(const NGLogicalOffset& other);
-
-  bool operator>(const NGLogicalOffset& other) const;
-  bool operator>=(const NGLogicalOffset& other) const;
-
-  bool operator<(const NGLogicalOffset& other) const;
-  bool operator<=(const NGLogicalOffset& other) const;
-
-  String ToString() const;
-};
-
-CORE_EXPORT inline std::ostream& operator<<(std::ostream& os,
-                                            const NGLogicalOffset& value) {
-  return os << value.ToString();
-}
+};
 
 // NGPhysicalOffset is the position of a rect (typically a fragment) relative to
 // its parent rect in the physical coordinate system.