Backed out changeset 6849ce51dfef (patch 3 from bug 468645) to fix bug 472353.

layout/base/nsCSSFrameConstructor.cpp

@@ -13398,13 +13398,6 @@ nsCSSFrameConstructor::RebuildAllStyleData(nsChangeHint aExtraHint)
   if (!mPresShell || !mPresShell->GetRootFrame())
     return;
 
-  if (mPresShell->GetPresContext()->IsPaginated()) {
-    // We don't support doing this because of bug 470929 and probably
-    // other issues.
-    NS_NOTREACHED("not allowed to rebuild all style data when paginated");
-    return;
-  }
-
   // Processing the style changes could cause a flush that propagates to
   // the parent frame and thus destroys the pres shell.
   nsCOMPtr<nsIPresShell> kungFuDeathGrip(mPresShell);

layout/base/nsPresContext.cpp

@@ -733,13 +733,6 @@ nsPresContext::GetUserPreferences()
 void
 nsPresContext::PreferenceChanged(const char* aPrefName)
 {
-  if (IsPaginated()) {
-    // Until we fix things so that we can do multiple reflows and style
-    // rebuilds (see, e.g., bug 470929) in paginated mode, we should
-    // ignore preference changes when paginated.
-    return;
-  }
-
   nsDependentCString prefName(aPrefName);
   if (prefName.EqualsLiteral("layout.css.dpi")) {
     PRInt32 oldAppUnitsPerDevPixel = AppUnitsPerDevPixel();