Clean up some "GetProperty" methods/functions.

src/runtime.h

Index: src/runtime.h
diff --git a/src/runtime.h b/src/runtime.h
index 58cd5259c9b89ff1160f1043fcaa5398e6526a67..190a693454bb683a8e974ed32820e330a24c2a28 100644
--- a/src/runtime.h
+++ b/src/runtime.h
@@ -846,15 +846,9 @@ class Runtime : public AllStatic {
       Handle<JSReceiver> object,
       Handle<Object> key);
 
-  MUST_USE_RESULT static MaybeObject* GetObjectProperty(
-      Isolate* isolate,
-      Handle<Object> object,
-      Handle<Object> key);
-
-  MUST_USE_RESULT static MaybeObject* GetObjectPropertyOrFail(
-      Isolate* isolate,
-      Handle<Object> object,
-      Handle<Object> key);
+  static Handle<Object> GetObjectProperty(Isolate* isolate,
+                                          Handle<Object> object,
+                                          Handle<Object> key);
 
   static void SetupArrayBuffer(Isolate* isolate,
                                Handle<JSArrayBuffer> array_buffer,