Make Failure inherit from MaybeObject instead of Object.

src/liveedit.h

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 65 matching lines @@
 
 #ifdef ENABLE_DEBUGGER_SUPPORT
 
 class LiveEdit : AllStatic {
  public:
   static JSArray* GatherCompileInfo(Handle<Script> script,
                                     Handle<String> source);
 
   static void WrapSharedFunctionInfos(Handle<JSArray> array);
 
-  static Object* ReplaceFunctionCode(Handle<JSArray> new_compile_info_array,
-                                     Handle<JSArray> shared_info_array);
+  MUST_USE_RESULT static MaybeObject* ReplaceFunctionCode(
+      Handle<JSArray> new_compile_info_array,
+      Handle<JSArray> shared_info_array);
 
   // Updates script field in FunctionSharedInfo.
   static void SetFunctionScript(Handle<JSValue> function_wrapper,
                                 Handle<Object> script_handle);
 
-  static Object* PatchFunctionPositions(
+  MUST_USE_RESULT static MaybeObject* PatchFunctionPositions(
       Handle<JSArray> shared_info_array, Handle<JSArray> position_change_array);
 
   // For a script updates its source field. If old_script_name is provided
   // (i.e. is a String), also creates a copy of the script with its original
   // source and sends notification to debugger.
   static Object* ChangeScriptSource(Handle<Script> original_script,
                                     Handle<String> new_source,
                                     Handle<Object> old_script_name);
 
   // In a code of a parent function replaces original function as embedded
@@ skipping 57 matching lines @@
   static void CalculateDifference(Input* input,
                                   Output* result_writer);
 };
 
 #endif  // ENABLE_DEBUGGER_SUPPORT
 
 
 } }  // namespace v8::internal
 
 #endif /* V*_LIVEEDIT_H_ */