Make Failure inherit from MaybeObject instead of Object.

src/debug.cc

Index: src/debug.cc
===================================================================
--- src/debug.cc	(revision 5696)
+++ src/debug.cc	(working copy)
@@ -1038,7 +1038,7 @@
       Factory::LookupAsciiSymbol("IsBreakPointTriggered");
   Handle<JSFunction> check_break_point =
     Handle<JSFunction>(JSFunction::cast(
-        debug_context()->global()->GetProperty(
+        debug_context()->global()->GetPropertyNoExceptionThrown(
             *is_break_point_triggered_symbol)));
 
   // Get the break id as an object.
@@ -1847,7 +1847,8 @@
   // Clear the mirror cache.
   Handle<String> function_name =
       Factory::LookupSymbol(CStrVector("ClearMirrorCache"));
-  Handle<Object> fun(Top::global()->GetProperty(*function_name));
+  Handle<Object> fun(Top::global()->GetPropertyNoExceptionThrown(
+      *function_name));
   ASSERT(fun->IsJSFunction());
   bool caught_exception;
   Handle<Object> js_object = Execution::TryCall(
@@ -1954,7 +1955,8 @@
 
   // Create the execution state object.
   Handle<String> constructor_str = Factory::LookupSymbol(constructor_name);
-  Handle<Object> constructor(Top::global()->GetProperty(*constructor_str));
+  Handle<Object> constructor(Top::global()->GetPropertyNoExceptionThrown(
+      *constructor_str));
   ASSERT(constructor->IsJSFunction());
   if (!constructor->IsJSFunction()) {
     *caught_exception = true;
@@ -2181,8 +2183,8 @@
   Handle<String> update_script_break_points_symbol =
       Factory::LookupAsciiSymbol("UpdateScriptBreakPoints");
   Handle<Object> update_script_break_points =
-      Handle<Object>(Debug::debug_context()->global()->GetProperty(
-          *update_script_break_points_symbol));
+      Handle<Object>(Debug::debug_context()->global()->
+          GetPropertyNoExceptionThrown(*update_script_break_points_symbol));
   if (!update_script_break_points->IsJSFunction()) {
     return;
   }