Selection API: Show a deprecation message for a quirky addRange() behavior.

third_party/WebKit/Source/core/frame/Deprecation.cpp

Index: third_party/WebKit/Source/core/frame/Deprecation.cpp
diff --git a/third_party/WebKit/Source/core/frame/Deprecation.cpp b/third_party/WebKit/Source/core/frame/Deprecation.cpp
index 7ab9849d9f72a640a371fa8585bb398fb61afe39..79bdd6a332c584f4e1dd0701618b56c95911295e 100644
--- a/third_party/WebKit/Source/core/frame/Deprecation.cpp
+++ b/third_party/WebKit/Source/core/frame/Deprecation.cpp
@@ -417,6 +417,12 @@ String Deprecation::deprecationMessage(UseCounter::Feature feature) {
     case UseCounter::CSSZoomDocument:
       return willBeRemoved("\"zoom: document\"", M59, "4997605029314560");
 
+    case UseCounter::SelectionAddRangeIntersect:
+      return willBeRemoved(
+          "The behavior that Selection.addRange() merges existing Range and "
+          "the specified Range",
+          M58, "6680566019653632");
+
     // Features that aren't deprecated don't have a deprecation message.
     default:
       return String();