[DMC #17.5] Eliminate DocumentMarker and TextMatchMarker copy constructors

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

Index: third_party/WebKit/Source/core/editing/markers/DocumentMarker.cpp
diff --git a/third_party/WebKit/Source/core/editing/markers/DocumentMarker.cpp b/third_party/WebKit/Source/core/editing/markers/DocumentMarker.cpp
index b3b2c60c8eaa68108f474a5cbb60d7d438859b97..1accf9afe0e92d19460b3694e0dc88531de4e071 100644
--- a/third_party/WebKit/Source/core/editing/markers/DocumentMarker.cpp
+++ b/third_party/WebKit/Source/core/editing/markers/DocumentMarker.cpp
@@ -169,12 +169,6 @@ DocumentMarker::DocumentMarker(unsigned start_offset,
                                                     thick,
                                                     background_color)) {}
 
-DocumentMarker::DocumentMarker(const DocumentMarker& marker)
-    : type_(marker.GetType()),
-      start_offset_(marker.StartOffset()),
-      end_offset_(marker.EndOffset()),
-      details_(marker.Details()) {}
-
 Optional<DocumentMarker::MarkerOffsets>
 DocumentMarker::ComputeOffsetsAfterShift(unsigned offset,
                                          unsigned old_length,