--- a/layout/base/RestyleManager.cpp
+++ b/layout/base/RestyleManager.cpp
@@ -150,18 +150,17 @@ RestyleManager::RestyleForInsertOrChange
   // The container might be a document or a ShadowRoot.
   if (!aContainer->IsElement()) {
     return;
   }
   Element* container = aContainer->AsElement();
 
   NS_ASSERTION(!aChild->IsRootOfAnonymousSubtree(),
                "anonymous nodes should not be in child lists");
-  uint32_t selectorFlags =
-    container ? (container->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0;
+  uint32_t selectorFlags = container->GetFlags() & NODE_ALL_SELECTOR_FLAGS;
   if (selectorFlags == 0)
     return;
 
   if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) {
     // see whether we need to restyle the container
     bool wasEmpty = true; // :empty or :-moz-only-whitespace
     for (nsIContent* child = container->GetFirstChild();
          child;
@@ -245,18 +244,17 @@ RestyleManager::ContentRemoved(nsINode* 
 
   if (aOldChild->IsRootOfAnonymousSubtree()) {
     // This should be an assert, but this is called incorrectly in
     // HTMLEditor::DeleteRefToAnonymousNode and the assertions were clogging
     // up the logs.  Make it an assert again when that's fixed.
     MOZ_ASSERT(aOldChild->GetProperty(nsGkAtoms::restylableAnonymousNode),
                "anonymous nodes should not be in child lists (bug 439258)");
   }
-  uint32_t selectorFlags =
-    container ? (container->GetFlags() & NODE_ALL_SELECTOR_FLAGS) : 0;
+  uint32_t selectorFlags = container->GetFlags() & NODE_ALL_SELECTOR_FLAGS;
   if (selectorFlags == 0)
     return;
 
   if (selectorFlags & NODE_HAS_EMPTY_SELECTOR) {
     // see whether we need to restyle the container
     bool isEmpty = true; // :empty or :-moz-only-whitespace
     for (nsIContent* child = container->GetFirstChild();
          child;