Bug 1516368 - Drop nsIDOMWindowUtils.isResolutionSet. r=botond

It's been unused since bug 1337325.

Depends on D15338

Differential Revision: https://phabricator.services.mozilla.com/D15339

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

dom/base/nsDOMWindowUtils.cpp

@@ -580,18 +580,6 @@ nsDOMWindowUtils::GetResolution(float* aResolution) {
   return NS_OK;
 }
 
-NS_IMETHODIMP
-nsDOMWindowUtils::GetIsResolutionSet(bool* aIsResolutionSet) {
-  nsIPresShell* presShell = GetPresShell();
-  if (!presShell) {
-    return NS_ERROR_FAILURE;
-  }
-
-  *aIsResolutionSet = presShell->IsResolutionSet();
-
-  return NS_OK;
-}
-
 NS_IMETHODIMP
 nsDOMWindowUtils::SetIsFirstPaint(bool aIsFirstPaint) {
   nsIPresShell* presShell = GetPresShell();

dom/interfaces/base/nsIDOMWindowUtils.idl

@@ -234,15 +234,6 @@ interface nsIDOMWindowUtils : nsISupports {
                             in uint32_t aDisplayWidth,
                             in uint32_t aDisplayHeight);
 
-  /**
-   * Whether the resolution has been set by the user.
-   * This gives a way to check whether the provided resolution is the default
-   * value or restored from a previous session.
-   *
-   * Can only be accessed with chrome privileges.
-   */
-  readonly attribute boolean isResolutionSet;
-
   /**
    * Whether the next paint should be flagged as the first paint for a document.
    * This gives a way to track the next paint that occurs after the flag is

layout/base/nsIPresShell.h

@@ -1393,11 +1393,6 @@ class nsIPresShell : public nsStubDocumentObserver {
    */
   virtual float GetCumulativeNonRootScaleResolution() = 0;
 
-  /**
-   * Was the current resolution set by the user or just default initialized?
-   */
-  bool IsResolutionSet() { return mResolution.isSome(); }
-
   /**
    * Used by session restore code to restore a resolution before the first
    * paint.