Fix assertion scope in Runtime_GetScript.

src/runtime/runtime-debug.cc

Index: src/runtime/runtime-debug.cc
diff --git a/src/runtime/runtime-debug.cc b/src/runtime/runtime-debug.cc
index 15551066e99bbe65df986880728f3e754df837e3..2de372f66ba8caf53816f7ee4187dabad4aff93e 100644
--- a/src/runtime/runtime-debug.cc
+++ b/src/runtime/runtime-debug.cc
@@ -2614,48 +2614,30 @@ RUNTIME_FUNCTION(Runtime_GetHeapUsage) {
 // traversals might be required rendering this operation as a rather slow
 // operation. However for setting break points which is normally done through
 // some kind of user interaction the performance is not crucial.
-static Handle<Object> Runtime_GetScriptFromScriptName(
-    Handle<String> script_name) {
-  // Scan the heap for Script objects to find the script with the requested
-  // script data.
-  Handle<Script> script;
-  Factory* factory = script_name->GetIsolate()->factory();
-  Heap* heap = script_name->GetHeap();
-  HeapIterator iterator(heap);
-  HeapObject* obj = NULL;
-  while (script.is_null() && ((obj = iterator.next()) != NULL)) {
-    // If a script is found check if it has the script data requested.
-    if (obj->IsScript()) {
-      if (Script::cast(obj)->name()->IsString()) {
-        if (String::cast(Script::cast(obj)->name())->Equals(*script_name)) {
-          script = Handle<Script>(Script::cast(obj));
-        }
-      }
-    }
-  }
-
-  // If no script with the requested script data is found return undefined.
-  if (script.is_null()) return factory->undefined_value();
-
-  // Return the script found.
-  return Script::GetWrapper(script);
-}
-
-
-// Get the script object from script data. NOTE: Regarding performance
-// see the NOTE for GetScriptFromScriptData.
-// args[0]: script data for the script to find the source for
 RUNTIME_FUNCTION(Runtime_GetScript) {
   HandleScope scope(isolate);
-
   DCHECK(args.length() == 1);
+  CONVERT_ARG_HANDLE_CHECKED(String, script_name, 0);
 
-  CONVERT_ARG_CHECKED(String, script_name, 0);
+  Handle<Script> found;
+  Heap* heap = isolate->heap();
+  {
+    HeapIterator iterator(heap);
+    HeapObject* obj = NULL;
+    while ((obj = iterator.next()) != NULL) {
+      if (!obj->IsScript()) continue;
+      Script* script = Script::cast(obj);
+      if (!script->name()->IsString()) continue;
+      String* name = String::cast(script->name());
+      if (name->Equals(*script_name)) {
+        found = Handle<Script>(script, isolate);
+        break;
+      }
+    }
+  }
 
-  // Find the requested script.
-  Handle<Object> result =
-      Runtime_GetScriptFromScriptName(Handle<String>(script_name));
-  return *result;
+  if (found.is_null()) return heap->undefined_value();
+  return *Script::GetWrapper(found);
 }