Remove unused DocumentMarker comparison operators

third_party/WebKit/Source/core/editing/markers/DocumentMarker.h

Index: third_party/WebKit/Source/core/editing/markers/DocumentMarker.h
diff --git a/third_party/WebKit/Source/core/editing/markers/DocumentMarker.h b/third_party/WebKit/Source/core/editing/markers/DocumentMarker.h
index 935f1d14ddcd8154896b84d7d7524f4936e1c4a3..8dd5d00fe07dc40929da92aa9b21d54df5804cac 100644
--- a/third_party/WebKit/Source/core/editing/markers/DocumentMarker.h
+++ b/third_party/WebKit/Source/core/editing/markers/DocumentMarker.h
@@ -180,13 +180,6 @@ class CORE_EXPORT DocumentMarker : public GarbageCollected<DocumentMarker> {
   void SetEndOffset(unsigned offset) { end_offset_ = offset; }
   void ShiftOffsets(int delta);
 
-  bool operator==(const DocumentMarker& o) const {
-    return GetType() == o.GetType() && StartOffset() == o.StartOffset() &&
-           EndOffset() == o.EndOffset();
-  }
-
-  bool operator!=(const DocumentMarker& o) const { return !(*this == o); }
-
   DECLARE_TRACE();
 
  private: