[CSS Typed OM] Rearrange StylePropertyMap classes to match the new spec.

third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h

Index: third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h
diff --git a/third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h b/third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h
index 62334aa709cb7f1984ed7be89597a8d4fbb37484..7ea52a29167aa6c2502d969b05da187a2061c9f5 100644
--- a/third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h
+++ b/third_party/WebKit/Source/core/css/cssom/ComputedStylePropertyMap.h
@@ -6,7 +6,7 @@
 #define ComputedStylePropertyMap_h
 
 #include "core/css/CSSComputedStyleDeclaration.h"
-#include "core/css/cssom/ImmutableStylePropertyMap.h"
+#include "core/css/cssom/StylePropertyMapReadonly.h"
 #include "core/dom/Node.h"
 #include "core/layout/LayoutObject.h"
 
@@ -20,7 +20,7 @@ namespace blink {
 // them as CSSStyleValues. The IDL for this class is in StylePropertyMap.idl.
 // The computed StylePropertyMapReadOnly for an element is accessed via
 // window.getComputedStyleMap(element) (see WindowGetComputedStyle.idl/h)
-class CORE_EXPORT ComputedStylePropertyMap : public ImmutableStylePropertyMap {
+class CORE_EXPORT ComputedStylePropertyMap : public StylePropertyMapReadonly {
   WTF_MAKE_NONCOPYABLE(ComputedStylePropertyMap);
 
  public:
@@ -34,7 +34,7 @@ class CORE_EXPORT ComputedStylePropertyMap : public ImmutableStylePropertyMap {
   DEFINE_INLINE_VIRTUAL_TRACE() {
     visitor->trace(m_computedStyleDeclaration);
     visitor->trace(m_node);
-    ImmutableStylePropertyMap::trace(visitor);
+    StylePropertyMapReadonly::trace(visitor);
   }
 
  private:
@@ -42,7 +42,7 @@ class CORE_EXPORT ComputedStylePropertyMap : public ImmutableStylePropertyMap {
 
  protected:
   ComputedStylePropertyMap(Node* node, const String& pseudoElement = String())
-      : ImmutableStylePropertyMap(),
+      : StylePropertyMapReadonly(),
         m_computedStyleDeclaration(
             CSSComputedStyleDeclaration::create(node, false, pseudoElement)),
         m_pseudoId(CSSSelector::parsePseudoId(pseudoElement)),