Prepare to add a use counter for Intl.v8BreakIterator

Source/bindings/core/v8/V8PerIsolateData.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 39 matching lines @@
 }
 #endif
 
 static void useCounterCallback(v8::Isolate* isolate, v8::Isolate::UseCounterFeature feature)
 {
     switch (feature) {
     case v8::Isolate::kUseAsm:
         UseCounter::count(currentExecutionContext(isolate), UseCounter::UseAsm);
         break;
     default:
-        ASSERT_NOT_REACHED();
+        // V8 may be a newer version that has some use counters we don't know
+        // about yet. FIXME: Add support for v8::Isolate::kBreakIterator and
+        // UseCounter::BreakIterator.
+        break;
     }
 }
 
 V8PerIsolateData::V8PerIsolateData()
     : m_destructionPending(false)
     , m_isolateHolder(adoptPtr(new gin::IsolateHolder()))
     , m_stringCache(adoptPtr(new StringCache(isolate())))
     , m_hiddenValue(adoptPtr(new V8HiddenValue()))
     , m_constructorMode(ConstructorMode::CreateNewObject)
     , m_recursionLevel(0)
@@ skipping 174 matching lines @@
 }
 
 IDBPendingTransactionMonitor* V8PerIsolateData::ensureIDBPendingTransactionMonitor()
 {
     if (!m_idbPendingTransactionMonitor)
         m_idbPendingTransactionMonitor = adoptPtr(new IDBPendingTransactionMonitor());
     return m_idbPendingTransactionMonitor.get();
 }
 
 } // namespace blink