Bug 913586 (Part 2) - Update Maybe users in accessible. r=asurkov

--HG--
extra : rebase_source : 521f090c8b37137877011ee057573f7baa62c5cb

accessible/windows/ia2/ia2Accessible.cpp

@@ -574,18 +574,18 @@ ia2Accessible::get_relationTargetsOfType(BSTR aType,
   Maybe<RelationType> relationType;
   for (uint32_t idx = 0; idx < ArrayLength(sRelationTypePairs); idx++) {
     if (wcscmp(aType, sRelationTypePairs[idx].second) == 0) {
-      relationType.construct(sRelationTypePairs[idx].first);
+      relationType.emplace(sRelationTypePairs[idx].first);
       break;
     }
   }
-  if (relationType.empty())
+  if (!relationType)
     return E_INVALIDARG;
 
   AccessibleWrap* acc = static_cast<AccessibleWrap*>(this);
   if (acc->IsDefunct())
     return CO_E_OBJNOTCONNECTED;
 
-  Relation rel = acc->RelationByType(relationType.ref());
+  Relation rel = acc->RelationByType(*relationType);
 
   nsTArray<Accessible*> targets;
   Accessible* target = nullptr;

accessible/windows/msaa/AccessibleWrap.cpp

@@ -900,7 +900,7 @@ AccessibleWrap::accNavigate(
 
 #define RELATIONTYPE(geckoType, stringType, atkType, msaaType, ia2Type) \
   case msaaType: \
-    xpRelation.construct(RelationType::geckoType); \
+    xpRelation.emplace(RelationType::geckoType); \
     break;
 
   switch(navDir) {
@@ -935,8 +935,8 @@ AccessibleWrap::accNavigate(
 
   pvarEndUpAt->vt = VT_EMPTY;
 
-  if (!xpRelation.empty()) {
-    Relation rel = RelationByType(xpRelation.ref());
+  if (xpRelation) {
+    Relation rel = RelationByType(*xpRelation);
     navAccessible = rel.Next();
   }