Tab value for context menu onclick event should be optional.

chrome/browser/extensions/menu_manager.cc

Index: chrome/browser/extensions/menu_manager.cc
diff --git a/chrome/browser/extensions/menu_manager.cc b/chrome/browser/extensions/menu_manager.cc
index 7f4d3250282b31aaa96459c8b56e6e2f40184b3c..9e29835393017c08436e27a6680804e6c361bcb9 100644
--- a/chrome/browser/extensions/menu_manager.cc
+++ b/chrome/browser/extensions/menu_manager.cc
@@ -640,11 +640,14 @@ void MenuManager::ExecuteCommand(Profile* profile,
   args->Append(properties);
 
   // Add the tab info to the argument list.
-  // Note: web_contents only NULL in unit tests :(
-  if (web_contents)
-    args->Append(ExtensionTabUtil::CreateTabValue(web_contents));
-  else
-    args->Append(new DictionaryValue());
+  // No tab info in a platform app.
+  if (!extension || !extension->is_platform_app()) {
+    // Note: web_contents only NULL in unit tests :(
+    if (web_contents)
+      args->Append(ExtensionTabUtil::CreateTabValue(web_contents));
+    else
+      args->Append(new DictionaryValue());
+  }
 
   if (item->type() == MenuItem::CHECKBOX ||
       item->type() == MenuItem::RADIO) {