Remove mutable from ComputedStyle by const_cast.

third_party/WebKit/Source/core/style/ComputedStyle.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 213 matching lines @@
       // affectedByActive
       // affectedByDrag
       // isLink
       // isInherited flags
     }
 
     bool operator!=(const NonInheritedData& other) const {
       return !(*this == other);
     }
 
-    // This is set if we used viewport units when resolving a length.
-    // It is mutable so we can pass around const ComputedStyles to resolve
-    // lengths.
-    mutable unsigned m_hasViewportUnits : 1;
-
-    mutable unsigned m_hasRemUnits : 1;
+    // These are set if we used viewport or rem units when resolving a length.
+    unsigned m_hasViewportUnits : 1;
+    unsigned m_hasRemUnits : 1;
 
     // If you add more style bits here, you will also need to update
     // ComputedStyle::copyNonInheritedFromCached() 68 bits
   } m_nonInheritedData;
 
   // !END SYNC!
 
  private:
   // TODO(sashab): Move these private members to the bottom of ComputedStyle.
   ALWAYS_INLINE ComputedStyle();
@@ skipping 2092 matching lines @@
   // Callback selectors.
   const Vector<String>& callbackSelectors() const {
     return m_rareNonInheritedData->m_callbackSelectors;
   }
   void addCallbackSelector(const String& selector);
 
   // Non-property flags.
   bool hasViewportUnits() const {
     return m_nonInheritedData.m_hasViewportUnits;
   }
-  void setHasViewportUnits(bool hasViewportUnits = true) const {
+  void setHasViewportUnits(bool hasViewportUnits = true) {
     m_nonInheritedData.m_hasViewportUnits = hasViewportUnits;
   }
 
   bool hasRemUnits() const { return m_nonInheritedData.m_hasRemUnits; }
-  void setHasRemUnits() const { m_nonInheritedData.m_hasRemUnits = true; }
+  void setHasRemUnits() { m_nonInheritedData.m_hasRemUnits = true; }
 
   bool emptyState() const { return m_emptyState; }
   void setEmptyState(bool b) {
     setUnique();
     m_emptyState = b;
   }
 
   bool hasInlineTransform() const {
     return m_rareNonInheritedData->m_hasInlineTransform;
   }
@@ skipping 1375 matching lines @@
   m_pseudoBits |= 1 << (pseudo - FirstPublicPseudoId);
 }
 
 inline bool ComputedStyle::hasPseudoElementStyle() const {
   return m_pseudoBits & ElementPseudoIdMask;
 }
 
 }  // namespace blink
 
 #endif  // ComputedStyle_h