Fixed a compiler warning by including nsHTMLParts.h

layout/generic/nsPageFrame.cpp

@@ -16,6 +16,7 @@
  * Reserved.
  */
 #include "nsPageFrame.h"
+#include "nsHTMLParts.h"
 #include "nsIContent.h"
 #include "nsIPresContext.h"
 #include "nsIStyleContext.h"

layout/html/base/src/nsPageFrame.cpp

@@ -16,6 +16,7 @@
  * Reserved.
  */
 #include "nsPageFrame.h"
+#include "nsHTMLParts.h"
 #include "nsIContent.h"
 #include "nsIPresContext.h"
 #include "nsIStyleContext.h"