Parse the script_badge manifest section.

chrome/browser/extensions/script_badge_controller.cc

Index: chrome/browser/extensions/script_badge_controller.cc
diff --git a/chrome/browser/extensions/script_badge_controller.cc b/chrome/browser/extensions/script_badge_controller.cc
index 7efd6a99a4e32176d5c80e69c245e44681624ff8..ce93f45d2d12c6467eeb687dfa513f6ac5b778d5 100644
--- a/chrome/browser/extensions/script_badge_controller.cc
+++ b/chrome/browser/extensions/script_badge_controller.cc
@@ -11,6 +11,7 @@
 #include "chrome/common/extensions/extension_action.h"
 #include "chrome/common/extensions/extension_messages.h"
 #include "chrome/common/extensions/extension_set.h"
+#include "chrome/common/extensions/extension_switch_utils.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
@@ -24,7 +25,10 @@ namespace extensions {
 ScriptBadgeController::ScriptBadgeController(TabContents* tab_contents)
     : content::WebContentsObserver(tab_contents->web_contents()),
       script_executor_(tab_contents->web_contents()),
-      tab_contents_(tab_contents) {}
+      tab_contents_(tab_contents) {
+  CHECK(switch_utils::IsActionBoxEnabled())
+      << "Without this, extension->script_badge() would return NULL.";
+}
 
 ScriptBadgeController::~ScriptBadgeController() {}
 
@@ -41,7 +45,7 @@ ScriptBadgeController::GetCurrentActions() {
        it != service->extensions()->end(); ++it) {
     const Extension* extension = *it;
     if (extensions_executing_scripts_.count(extension->id()))
-      current_actions->push_back(extension->GetScriptBadge());
+      current_actions->push_back(extension->script_badge());
   }
   return current_actions.Pass();
 }