Rename/tweak some StylePropertySet/CSSStyleDeclaration copying functions.

Source/core/css/resolver/ViewportStyleResolver.cpp

 /*
  * Copyright (C) 2012 Intel Corporation. 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.
@@ skipping 43 matching lines @@
 
 void ViewportStyleResolver::addViewportRule(StyleRuleViewport* viewportRule)
 {
     StylePropertySet* propertySet = viewportRule->mutableProperties();
 
     unsigned propertyCount = propertySet->propertyCount();
     if (!propertyCount)
         return;
 
     if (!m_propertySet) {
-        m_propertySet = propertySet->copy();
+        m_propertySet = propertySet->mutableCopy();
         return;
     }
 
     // We cannot use mergeAndOverrideOnConflict() here because it doesn't
     // respect the !important declaration (but addParsedProperty() does).
     for (unsigned i = 0; i < propertyCount; ++i)
         m_propertySet->addParsedProperty(propertySet->propertyAt(i).toCSSProperty());
 }
 
 void ViewportStyleResolver::clearDocument()
@@ skipping 83 matching lines @@
     case CSSValueFixed:
         return 0;
     default:
         return defaultValue;
     }
 }
 
 } // namespace WebCore
 
 #endif // ENABLE(CSS_DEVICE_ADAPTATION)