Oilpan: Remove GC_INFO_{DEFINE,DECLARE} macros

Source/build/scripts/templates/InternalSettingsGenerated.h.tmpl

 {% from "macros.tmpl" import license -%}
 {{ license() }}
 
 #ifndef InternalSettingsGenerated_h
 #define InternalSettingsGenerated_h
 
 #include "heap/Handle.h"
 #include "platform/RefCountedSupplement.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class Page;
 
 class InternalSettingsGenerated : public RefCountedWillBeGarbageCollectedFinalized<InternalSettingsGenerated> {
-    DECLARE_GC_INFO;
 public:
     explicit InternalSettingsGenerated(Page*);
     virtual ~InternalSettingsGenerated();
     void resetToConsistentState();
 {%- for setting in settings if setting.type|to_idl_type %}
     void set{{setting.name|upper_first}}({{setting.type|to_passing_type}} {{setting.name}});
 {%- endfor %}
 
     virtual void trace(Visitor*) { }
 
 private:
     Page* m_page;
 
     {%- for setting in settings if setting.type|to_idl_type %}
     {{setting.type}} m_{{setting.name}};
     {%- endfor %}
 };
 
 } // namespace WebCore
 
 #endif // InternalSettingsGenerated_h