[bindings] Cleanup unused method v8ValueUnsafe from ScriptValue

Source/bindings/core/v8/ScriptValue.h

Index: Source/bindings/core/v8/ScriptValue.h
diff --git a/Source/bindings/core/v8/ScriptValue.h b/Source/bindings/core/v8/ScriptValue.h
index 89135cae1233b7554b59ebeb8744a4ede11ae148..bb139370eb30911c5d7460c5c29afee341b73241 100644
--- a/Source/bindings/core/v8/ScriptValue.h
+++ b/Source/bindings/core/v8/ScriptValue.h
@@ -169,8 +169,6 @@ public:
     }
 
     v8::Local<v8::Value> v8Value() const;
-    // TODO(bashi): Remove v8ValueUnsafe().
-    v8::Local<v8::Value> v8ValueUnsafe() const;
     // Returns v8Value() if a given ScriptState is the same as the
     // ScriptState which is associated with this ScriptValue. Otherwise
     // this "clones" the v8 value and returns it.