Qualify RuntimeEnabledFeatures.h and remove unnecessary include dir.

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

 {% from "macros.tmpl" import license %}
 {{ license() }}
 
 #ifndef {{namespace}}ElementTypeHelpers_h
 #define {{namespace}}ElementTypeHelpers_h
 
 #include "core/dom/ContextFeatures.h"
 #include "core/dom/Element.h"
 #include "{{namespace}}Names.h"
-#include "RuntimeEnabledFeatures.h"
+#include "platform/RuntimeEnabledFeatures.h"
 
 namespace WebCore {
 // Type checking.
 {% for tag in tags|sort if not tag.multipleTagNames and not tag.noTypeHelpers %}
 {% filter enable_conditional(tag.Conditional) %}
 class {{tag.interface}};
 void is{{tag.interface}}(const {{tag.interface}}&); // Catch unnecessary runtime check of type known at compile time.
 void is{{tag.interface}}(const {{tag.interface}}*); // Catch unnecessary runtime check of type known at compile time.
 
 {# For HTML Elements, call hasLocalName() instead of hasTagName() to avoid checking the namespace unnecessarily #}
@@ skipping 37 matching lines @@
 // casting functions above. reinterpret_cast would be unsafe due to multiple inheritence.
 
 {% for tag in tags|sort if not tag.multipleTagNames and not tag.noTypeHelpers %}
 {% filter enable_conditional(tag.Conditional) %}
 #define to{{tag.interface}}(x) WebCore::toElement<WebCore::{{tag.interface}}>(x)
 {% endfilter %}
 {% endfor %}
 } // WebCore
 
 #endif