Have V8Clipboard::clearDataMethodCustom() use V8TRYCATCH_FOR_V8STRINGRESOURCE_VOID()

Source/core/platform/chromium/ClipboardChromium.cpp

 /*
  * Copyright (C) 2006, 2007 Apple Inc.  All rights reserved.
  * Copyright (C) 2008, 2009 Google Inc.
  *
  * 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
@@ skipping 228 matching lines @@
 {
     return adoptRef(new ClipboardChromium(clipboardType, dataObject, policy, frame));
 }
 
 void ClipboardChromium::clearData(const String& type)
 {
     if (!canWriteData())
         return;
 
     m_dataObject->clearData(normalizeType(type));
-
-    ASSERT_NOT_REACHED();
 }
 
 void ClipboardChromium::clearAllData()
 {
     if (!canWriteData())
         return;
 
     m_dataObject->clearAll();
 }
 
@@ skipping 211 matching lines @@
 
 PassRefPtr<DataTransferItemList> ClipboardChromium::items()
 {
     // FIXME: According to the spec, we are supposed to return the same collection of items each
     // time. We now return a wrapper that always wraps the *same* set of items, so JS shouldn't be
     // able to tell, but we probably still want to fix this.
     return DataTransferItemListPolicyWrapper::create(this, m_dataObject);
 }
 
 } // namespace WebCore