Bug 1550930 part 1. Stop using [array] for nsIDroppedLinkHandler.queryLinks. r=NeilDeakin

Differential Revision: https://phabricator.services.mozilla.com/D30768

--HG--
extra : moz-landing-system : lando

dom/base/ContentAreaDropListener.jsm

@@ -314,13 +314,9 @@ ContentAreaDropListener.prototype =
     }
   },
 
-  queryLinks: function(aDataTransfer, aCount)
+  queryLinks: function(aDataTransfer)
   {
-    let links = this._getDropLinks(aDataTransfer);
-    if (aCount) {
-      aCount.value = links.length;
-    }
-    return links;
+    return this._getDropLinks(aDataTransfer);
   },
 
   _eventTargetIsDisabled: function(aEvent)

dom/base/nsIDroppedLinkHandler.idl

@@ -97,9 +97,7 @@ interface nsIDroppedLinkHandler : nsISupports
    * it allows the parent to verify that the child did not modify links
    * being dropped.
    */
-  void queryLinks(in DataTransfer aDataTransfer,
-                  [optional] out unsigned long aCount,
-                  [retval, array, size_is(aCount)] out nsIDroppedLinkItem aLinks);
+  Array<nsIDroppedLinkItem> queryLinks(in DataTransfer aDataTransfer);
 
   /**
    * Given a drop event aEvent, determines the triggering principal for the

dom/ipc/BrowserParent.cpp

@@ -1391,42 +1391,36 @@ bool BrowserParent::QueryDropLinksForVerification() {
   // verification array and store all links that are being dragged.
   mVerifyDropLinks.Clear();
 
-  uint32_t linksCount = 0;
-  nsIDroppedLinkItem** droppedLinkedItems = nullptr;
-  dropHandler->QueryLinks(initialDataTransfer, &linksCount,
-                          &droppedLinkedItems);
+  nsTArray<RefPtr<nsIDroppedLinkItem>> droppedLinkItems;
+  dropHandler->QueryLinks(initialDataTransfer, droppedLinkItems);
 
   // Since the entire event is cancelled if one of the links is invalid,
   // we can store all links on the parent side without any prior
   // validation checks.
   nsresult rv = NS_OK;
-  for (uint32_t i = 0; i < linksCount; i++) {
+  for (nsIDroppedLinkItem* item : droppedLinkItems) {
     nsString tmp;
-    rv = droppedLinkedItems[i]->GetUrl(tmp);
+    rv = item->GetUrl(tmp);
     if (NS_FAILED(rv)) {
       NS_WARNING("Failed to query url for verification");
       break;
     }
     mVerifyDropLinks.AppendElement(tmp);
 
-    rv = droppedLinkedItems[i]->GetName(tmp);
+    rv = item->GetName(tmp);
     if (NS_FAILED(rv)) {
       NS_WARNING("Failed to query name for verification");
       break;
     }
     mVerifyDropLinks.AppendElement(tmp);
 
-    rv = droppedLinkedItems[i]->GetType(tmp);
+    rv = item->GetType(tmp);
     if (NS_FAILED(rv)) {
       NS_WARNING("Failed to query type for verification");
       break;
     }
     mVerifyDropLinks.AppendElement(tmp);
   }
-  for (uint32_t i = 0; i < linksCount; i++) {
-    NS_IF_RELEASE(droppedLinkedItems[i]);
-  }
-  free(droppedLinkedItems);
   if (NS_FAILED(rv)) {
     mVerifyDropLinks.Clear();
     return false;