Bug 1460807 - Drop DOMWindowUtils.requestCompositorProperty. r=kats

The function was introduced in bug 1057088, and has been unused since
bug 1352151.

MozReview-Commit-ID: 4Nfvj4gGdSY

--HG--
extra : rebase_source : 9f713d954ec9f9a631c27656af12d9e125e56d9f

dom/base/nsDOMWindowUtils.cpp

@@ -3628,21 +3628,6 @@ nsDOMWindowUtils::DispatchEventToChromeOnly(EventTarget* aTarget,
   return NS_OK;
 }
 
-NS_IMETHODIMP
-nsDOMWindowUtils::RequestCompositorProperty(const nsAString& property,
-                                            float* aResult)
-{
-  if (nsIWidget* widget = GetWidget()) {
-    mozilla::layers::LayerManager* manager = widget->GetLayerManager();
-    if (manager) {
-      *aResult = manager->RequestProperty(property);
-      return NS_OK;
-    }
-  }
-
-  return NS_ERROR_NOT_AVAILABLE;
-}
-
 NS_IMETHODIMP
 nsDOMWindowUtils::GetOMTAStyle(Element* aElement,
                                const nsAString& aProperty,

dom/interfaces/base/nsIDOMWindowUtils.idl

@@ -1697,16 +1697,6 @@ interface nsIDOMWindowUtils : nsISupports {
   AString getOMTAStyle(in Element aElement, in AString aProperty,
                        [optional] in AString aPseudoElement);
 
-  /**
-   * Special function that gets a property syncronously from the last composite
-   * that occured.
-   *
-   * Supported properties:
-   *   "overdraw": Report a percentage between 0 and 999 indicate how many times
-   *               each pixels on the destination window have been touched.
-   */
-  float requestCompositorProperty(in AString aProperty);
-
   /**
    * If aHandlingInput is true, this informs the event state manager that
    * we're handling user input. Otherwise, this is a no-op (as by default