[DMC #25] Make DocumentMarker::GetType() virtual

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

Index: third_party/WebKit/Source/core/editing/markers/GrammarMarker.cpp
diff --git a/third_party/WebKit/Source/core/editing/markers/GrammarMarker.cpp b/third_party/WebKit/Source/core/editing/markers/GrammarMarker.cpp
index a2b8d5c9416fc3b652ec791a130919f8768f9130..a668ea991bdc97b4786b9f8a0f0e00a84001ba8c 100644
--- a/third_party/WebKit/Source/core/editing/markers/GrammarMarker.cpp
+++ b/third_party/WebKit/Source/core/editing/markers/GrammarMarker.cpp
@@ -9,9 +9,10 @@ namespace blink {
 GrammarMarker::GrammarMarker(unsigned start_offset,
                              unsigned end_offset,
                              const String& description)
-    : SpellCheckMarker(DocumentMarker::kGrammar,
-                       start_offset,
-                       end_offset,
-                       description) {}
+    : SpellCheckMarker(start_offset, end_offset, description) {}
+
+DocumentMarker::MarkerType GrammarMarker::GetType() const {
+  return DocumentMarker::kGrammar;
+}
 
 }  // namespace blink