DevTools: consistently use Maybe for optional values in the protocol generator.

third_party/WebKit/Source/modules/accessibility/InspectorAccessibilityAgent.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/accessibility/InspectorAccessibilityAgent.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/DOMNodeIds.h"
 #include "core/dom/Element.h"
@@ skipping 238 matching lines @@
 PassOwnPtr<AXProperty> createRelatedNodeListProperty(const String& key, AXRelatedObjectVector& nodes)
 {
     OwnPtr<AXValue> nodeListValue = createRelatedNodeListValue(nodes, AXValueTypeEnum::NodeList);
     return createProperty(key, nodeListValue.release());
 }
 
 PassOwnPtr<AXProperty> createRelatedNodeListProperty(const String& key, AXObject::AXObjectVector& nodes, const QualifiedName& attr, AXObject* axObject)
 {
     OwnPtr<AXValue> nodeListValue = createRelatedNodeListValue(nodes);
     const AtomicString& attrValue = axObject->getAttribute(attr);
-    nodeListValue->setValue(JSONString::create(attrValue));
+    nodeListValue->setValue(JSONString::create(attrValue).get());
     return createProperty(key, nodeListValue.release());
 }
 
 void fillRelationships(AXObject* axObject, protocol::Array<AXProperty>* properties)
 {
     if (AXObject* activeDescendant = axObject->activeDescendant()) {
         properties->addItem(createProperty(AXRelationshipAttributesEnum::Activedescendant, createRelatedNodeListValue(activeDescendant)));
     }
 
     AXObject::AXObjectVector results;
@@ skipping 87 matching lines @@
 }
 
 } // namespace
 
 InspectorAccessibilityAgent::InspectorAccessibilityAgent(Page* page)
     : InspectorBaseAgent<InspectorAccessibilityAgent, protocol::Frontend::Accessibility>("Accessibility")
     , m_page(page)
 {
 }
 
-void InspectorAccessibilityAgent::getAXNode(ErrorString* errorString, int nodeId, OwnPtr<AXNode>* accessibilityNode)
+void InspectorAccessibilityAgent::getAXNode(ErrorString* errorString, int nodeId, Maybe<AXNode>* accessibilityNode)
 {
     Frame* mainFrame = m_page->mainFrame();
     if (!mainFrame->isLocalFrame()) {
         *errorString = "Can't inspect out of process frames yet";
         return;
     }
 
     InspectorDOMAgent* domAgent = toLocalFrame(mainFrame)->instrumentingAgents()->inspectorDOMAgent();
     if (!domAgent) {
         *errorString = "DOM agent must be enabled";
@@ skipping 22 matching lines @@
     *accessibilityNode = buildObjectForNode(node, axObject, cacheImpl, properties.release());
 }
 
 DEFINE_TRACE(InspectorAccessibilityAgent)
 {
     visitor->trace(m_page);
     InspectorBaseAgent::trace(visitor);
 }
 
 } // namespace blink