WebUI: Fix lifecycle-bug when RenderFrameHost is swapped out

content/public/browser/web_ui_message_handler.h

Index: content/public/browser/web_ui_message_handler.h
diff --git a/content/public/browser/web_ui_message_handler.h b/content/public/browser/web_ui_message_handler.h
index ed0117931f59bc8cc8db1b135a2c606aea0c2015..20c1afcf500be770a999fffd8f373ac6f66c9c0c 100644
--- a/content/public/browser/web_ui_message_handler.h
+++ b/content/public/browser/web_ui_message_handler.h
@@ -35,6 +35,9 @@ class CONTENT_EXPORT WebUIMessageHandler {
   WebUIMessageHandler() : javascript_allowed_(false), web_ui_(nullptr) {}
   virtual ~WebUIMessageHandler() {}
 
+  // Call this when a page should not receive JavaScript messages.
+  void DisallowJavascript();
+
  protected:
   FRIEND_TEST_ALL_PREFIXES(WebUIMessageHandlerTest, ExtractIntegerValue);
   FRIEND_TEST_ALL_PREFIXES(WebUIMessageHandlerTest, ExtractDoubleValue);
@@ -44,9 +47,6 @@ class CONTENT_EXPORT WebUIMessageHandler {
   // from this handler.
   void AllowJavascript();
 
-  // Call this when a page should not receive JavaScript messages.
-  void DisallowJavascript();
-
   bool IsJavascriptAllowed() const;
 
   // Helper methods: