Stop using WebCore namespace in generated code

Source/build/scripts/templates/EventFactory.cpp.tmpl

 {% from 'macros.tmpl' import license %}
 {{license()}}
 
 #include "config.h"
 {% if suffix == 'Modules' %}
 #include "modules/{{namespace}}{{suffix}}Factory.h"
 {% else %}
 #include "core/events/{{namespace}}Factory.h"
 {% endif %}
 
 #include "{{namespace}}{{suffix}}Headers.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
-namespace WebCore {
+namespace blink {
 
 PassRefPtrWillBeRawPtr<{{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 WebCore
+} // namespace blink