Delete the extensions i18n message map when extension unload is received.

chrome/renderer/extensions/dispatcher.cc

Index: chrome/renderer/extensions/dispatcher.cc
diff --git a/chrome/renderer/extensions/dispatcher.cc b/chrome/renderer/extensions/dispatcher.cc
index 94a90d6dd15e027f56171962a0c3e7041b9f7f32..9f32b9175f39c12330ba5dbc9170f06316f1d34e 100644
--- a/chrome/renderer/extensions/dispatcher.cc
+++ b/chrome/renderer/extensions/dispatcher.cc
@@ -15,6 +15,7 @@
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "chrome/common/extensions/manifest.h"
+#include "chrome/common/extensions/message_bundle.h"
 #include "chrome/common/extensions/permissions/permission_set.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/common/view_type.h"
@@ -514,6 +515,10 @@ void Dispatcher::OnUnloaded(const std::string& id) {
 
   v8_context_set_.OnExtensionUnloaded(id);
 
+  // Invalidates messages map for id incase extension is reloaded with

[Devlin, 2013/02/22 19:59:07]

"Invalidates _the_ messages map for the extension _in case_ the extension is
reloaded with _a_ new messages map."

[Patrick Riordan, 2013/02/26 05:05:20]

Done.

+  // new messages map.
+  EraseL10nMessagesMap(id);
+
   // We don't do anything with existing platform-app stylesheets. They will
   // stay resident, but the URL pattern corresponding to the unloaded
   // extension's URL just won't match anything anymore.