Simplify OriginTrialContext and the way it validates tokens.

third_party/WebKit/Source/build/scripts/templates/OriginTrials.cpp.tmpl

 {% from 'macros.tmpl' import license %}
 {{license()}}
 
 #include "core/origin_trials/OriginTrials.h"
 
 #include "core/origin_trials/OriginTrialContext.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
-namespace {
-
 {% for feature in features %}
 {% if feature.origin_trial_feature_name %}
 
-bool {{feature.first_lowered_name}}EnabledImpl(ExecutionContext* executionContext, String* errorMessage) {
+bool OriginTrials::{{feature.first_lowered_name}}Enabled(ExecutionContext* executionContext) {
     if (RuntimeEnabledFeatures::{{feature.first_lowered_name}}Enabled())
         return true;
-    OriginTrialContext* context = OriginTrialContext::from(executionContext);
-    return context->isFeatureEnabled("{{feature.origin_trial_feature_name}}", errorMessage);
+    OriginTrialContext* context = OriginTrialContext::from(executionContext, OriginTrialContext::DontCreateIfNotExists);
+    return context && context->isFeatureEnabled("{{feature.origin_trial_feature_name}}");
 }
 
 {% endif %}
-{% endfor %}
-
-} // namespace
-
-{% for feature in features %}
-{% if feature.origin_trial_feature_name %}
-
-bool OriginTrials::{{feature.first_lowered_name}}Enabled(ExecutionContext* executionContext, String& errorMessage) {
-    return {{feature.first_lowered_name}}EnabledImpl(executionContext, &errorMessage);
-}
-
-bool OriginTrials::{{feature.first_lowered_name}}Enabled(ExecutionContext* executionContext) {
-    return {{feature.first_lowered_name}}EnabledImpl(executionContext, nullptr);
-}
-
-{% endif %}
 {% endfor %}
 
 } // namespace blink