Reduce usage of WebString::data

Source/core/platform/chromium/support/WebString.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:
  *
  *     * 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
@@ skipping 46 matching lines @@
 void WebString::assign(const WebUChar* data, size_t length)
 {
     assign(static_cast<WebStringPrivate*>(StringImpl::create8BitIfPossible(data, length).get()));
 }
 
 size_t WebString::length() const
 {
     return m_private ? const_cast<WebStringPrivate*>(m_private)->length() : 0;
 }
 
+WebUChar WebString::at(unsigned i) const
+{
+    ASSERT(m_private);
+    return (*m_private)[i];
+}
+
 const WebUChar* WebString::data() const
 {
     return m_private ? const_cast<WebStringPrivate*>(m_private)->characters() : 0;
 }
 
 WebCString WebString::utf8() const
 {
     return WTF::String(m_private).utf8();
 }
 
@@ skipping 51 matching lines @@
 {
     // Take care to handle the case where m_private == p
     if (p)
         p->ref();
     if (m_private)
         m_private->deref();
     m_private = p;
 }
 
 } // namespace WebKit