Oilpan: Remove GC_INFO_{DEFINE,DECLARE} macros

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

 {% from "macros.tmpl" import wrap_with_condition, license -%}
 {{ license() }}
 
 #ifndef InternalRuntimeFlags_h
 #define InternalRuntimeFlags_h
 
 #include "RuntimeEnabledFeatures.h"
 #include "heap/Handle.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefPtr.h"
 #include "wtf/RefCounted.h"
 
 namespace WebCore {
 
 class InternalRuntimeFlags : public RefCountedWillBeGarbageCollected<InternalRuntimeFlags> {
-    DECLARE_GC_INFO;
 public:
     static PassRefPtrWillBeRawPtr<InternalRuntimeFlags> create()
     {
         return adoptRefWillBeNoop(new InternalRuntimeFlags);
     }
 
 {#-
     Setting after startup does not work for most runtime flags, but we
     could add an option to print setters for ones which do:
     void set{{feature.name}}Enabled(bool isEnabled) { RuntimeEnabledFeatures::set{{feature.name}}Enabled(isEnabled); }
     If we do that, we also need to respect Internals::resetToConsistentState.
 #}
 {% for feature in features if not feature.custom %}
 {%- call wrap_with_condition(feature.condition) %}
     bool {{feature.first_lowered_name}}Enabled() { return RuntimeEnabledFeatures::{{feature.first_lowered_name}}Enabled(); }
 {%- endcall %}
 {% endfor %}
 
     void trace(Visitor*) { }
 
 private:
     InternalRuntimeFlags() { }
 };
 
 } // namespace WebCore
 
 #endif // InternalRuntimeFlags_h