Use jinja2 for make_runtime_features and make_internal_runtime_flags

Source/core/scripts/templates/RuntimeEnabledFeatures.cpp.tmpl

+{% from "macros.tmpl" import wrap_with_condition, license -%}
+{{ license() }}
+
+#include "config.h"
+#include "RuntimeEnabledFeatures.h"
+
+namespace WebCore {
+
+{% for feature_set in feature_sets %}
+void RuntimeEnabledFeatures::set{{feature_set|capitalize}}FeaturesEnabled(bool enable)
+{
+{%- for feature in features if feature.status == feature_set %}
+    set{{feature.name}}Enabled(enable);
+{%- endfor %}
+}
+{% endfor %}
+
+{%- for feature in features if not feature.custom %}
+{%- call wrap_with_condition(feature.condition) %}
+bool RuntimeEnabledFeatures::is{{feature.name}}Enabled = false;
+{%- endcall %}
+{%- endfor %}
+
+} // namespace WebCore
+