Track the active ExtensionKeybindingRegistry and make it available to EventRewriter.

chrome/browser/ui/views/toolbar/browser_actions_container.cc

Index: chrome/browser/ui/views/toolbar/browser_actions_container.cc
diff --git a/chrome/browser/ui/views/toolbar/browser_actions_container.cc b/chrome/browser/ui/views/toolbar/browser_actions_container.cc
index 5ed94f3e2f00e37eb91ffd966dbf4b2c33d79a12..75466b38d7d0637f9be7278da845c2afedfca0f5 100644
--- a/chrome/browser/ui/views/toolbar/browser_actions_container.cc
+++ b/chrome/browser/ui/views/toolbar/browser_actions_container.cc
@@ -269,6 +269,11 @@ void BrowserActionsContainer::ExecuteExtensionCommand(
                                                  command.accelerator());
 }
 
+bool BrowserActionsContainer::IsExtensionCommandRegistered(
+    const ui::Accelerator& accelerator) {
+  return extension_keybinding_registry_->IsAcceleratorRegistered(accelerator);
+}
+
 bool BrowserActionsContainer::ShownInsideMenu() const {
   return in_overflow_mode();
 }