Remove the EventFactory machinery.

sky/engine/build/scripts/templates/EventFactory.cpp.tmpl

-{% from 'macros.tmpl' import license %}
-{{license()}}
-
-#include "config.h"
-#include "core/events/{{namespace}}Factory.h"
-
-#include "{{namespace}}{{suffix}}Headers.h"
-#include "gen/sky/platform/RuntimeEnabledFeatures.h"
-
-namespace blink {
-
-PassRefPtr<{{namespace}}> {{namespace}}{{suffix}}Factory::create(const String& type)
-{
-    {% for event in events %}
-    {% filter enable_conditional(event.Conditional) %}
-    {% if event|script_name|case_insensitive_matching %}
-    if (equalIgnoringCase(type, "{{event|script_name}}"){% if event.RuntimeEnabled %} && RuntimeEnabledFeatures::{{event.RuntimeEnabled|lower_first}}(){% endif %})
-    {% else %}
-    if (type == "{{event|script_name}}"{% if event.RuntimeEnabled %} && RuntimeEnabledFeatures::{{event.RuntimeEnabled|lower_first}}(){% endif %})
-    {% endif %}
-        return {{event|cpp_name}}::create();
-    {% endfilter %}
-    {% endfor %}
-    return nullptr;
-}
-
-} // namespace blink