Bug 1292502 Fix mismatch between mModalStateDepth and mSuspendedDoc r=smaug

dom/base/nsGlobalWindow.cpp

@@ -8789,11 +8789,11 @@ nsGlobalWindow::EnterModalState()
   }
 
   if (topWin->mModalStateDepth == 0) {
-    NS_ASSERTION(!mSuspendedDoc, "Shouldn't have mSuspendedDoc here!");
+    NS_ASSERTION(!topWin->mSuspendedDoc, "Shouldn't have mSuspendedDoc here!");
 
-    mSuspendedDoc = topDoc;
-    if (mSuspendedDoc) {
-      mSuspendedDoc->SuppressEventHandling(nsIDocument::eAnimationsOnly);
+    topWin->mSuspendedDoc = topDoc;
+    if (topDoc) {
+      topDoc->SuppressEventHandling(nsIDocument::eAnimationsOnly);
     }
   }
   topWin->mModalStateDepth++;
@@ -8881,11 +8881,11 @@ nsGlobalWindow::LeaveModalState()
     if (NS_FAILED(NS_DispatchToCurrentThread(runner)))
       NS_WARNING("failed to dispatch pending timeout runnable");
 
-    if (mSuspendedDoc) {
+    if (topWin->mSuspendedDoc) {
       nsCOMPtr<nsIDocument> currentDoc = topWin->GetExtantDoc();
-      mSuspendedDoc->UnsuppressEventHandlingAndFireEvents(nsIDocument::eAnimationsOnly,
-                                                          currentDoc == mSuspendedDoc);
-      mSuspendedDoc = nullptr;
+      topWin->mSuspendedDoc->UnsuppressEventHandlingAndFireEvents(nsIDocument::eAnimationsOnly,
+                                                                  currentDoc == topWin->mSuspendedDoc);
+      topWin->mSuspendedDoc = nullptr;
     }
   }