Make some ScriptValue references const

Source/core/css/FontFaceSet.cpp

 /*
  * Copyright (C) 2013 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 344 matching lines @@
     Document* d = document();
     d->ensureStyleResolver(); // Flush pending style changes.
     return d->styleEngine()->fontSelector()->fontFaceCache()->cssConnectedFontFaces();
 }
 
 bool FontFaceSet::isCSSConnectedFontFace(FontFace* fontFace) const
 {
     return cssConnectedFontFaceList().contains(fontFace);
 }
 
-void FontFaceSet::forEach(PassOwnPtr<FontFaceSetForEachCallback> callback, ScriptValue& thisArg) const
+void FontFaceSet::forEach(PassOwnPtr<FontFaceSetForEachCallback> callback, const ScriptValue& thisArg) const
 {
     forEachInternal(callback, &thisArg);
 }
 
 void FontFaceSet::forEach(PassOwnPtr<FontFaceSetForEachCallback> callback) const
 {
     forEachInternal(callback, 0);
 }
 
-void FontFaceSet::forEachInternal(PassOwnPtr<FontFaceSetForEachCallback> callback, ScriptValue* thisArg) const
+void FontFaceSet::forEachInternal(PassOwnPtr<FontFaceSetForEachCallback> callback, const ScriptValue* thisArg) const
 {
     if (!inActiveDocumentContext())
         return;
     const WillBeHeapListHashSet<RefPtrWillBeMember<FontFace> >& cssConnectedFaces = cssConnectedFontFaceList();
     WillBeHeapVector<RefPtrWillBeMember<FontFace> > fontFaces;
     fontFaces.reserveInitialCapacity(cssConnectedFaces.size() + m_nonCSSConnectedFaces.size());
     for (WillBeHeapListHashSet<RefPtrWillBeMember<FontFace> >::const_iterator it = cssConnectedFaces.begin(); it != cssConnectedFaces.end(); ++it)
         fontFaces.append(*it);
     for (WillBeHeapListHashSet<RefPtrWillBeMember<FontFace> >::const_iterator it = m_nonCSSConnectedFaces.begin(); it != m_nonCSSConnectedFaces.end(); ++it)
         fontFaces.append(*it);
@@ skipping 212 matching lines @@
     visitor->trace(m_loadingFonts);
     visitor->trace(m_loadedFonts);
     visitor->trace(m_failedFonts);
     visitor->trace(m_nonCSSConnectedFaces);
     DocumentSupplement::trace(visitor);
     EventTargetWithInlineData::trace(visitor);
 }
 #endif
 
 } // namespace blink