Introduce bad_message.h for chrome and NaCl.

content/public/browser/browser_message_filter.h

Index: content/public/browser/browser_message_filter.h
diff --git a/content/public/browser/browser_message_filter.h b/content/public/browser/browser_message_filter.h
index 1966e5846e74b0661d4e2a3fa37907d5268aaa99..183ccba2c07b3c2233474544d46ebd64bb9b5e4f 100644
--- a/content/public/browser/browser_message_filter.h
+++ b/content/public/browser/browser_message_filter.h
@@ -92,9 +92,10 @@ class CONTENT_EXPORT BrowserMessageFilter
   static bool CheckCanDispatchOnUI(const IPC::Message& message,
                                    IPC::Sender* sender);
 
-  // Call this if a message couldn't be deserialized.  This kills the renderer.
-  // Can be called on any thread.
-  virtual void BadMessageReceived();
+  // Called by bad_message.h helpers if a message couldn't be deserialized. This
+  // kills the renderer.  Can be called on any thread.  This doesn't log the
+  // error details to UMA, so use the bad_message.h for your module instead.
+  virtual void ShutdownForBadMessage();
 
   const std::vector<uint32>& message_classes_to_filter() const {
     return message_classes_to_filter_;