Track the active ExtensionKeybindingRegistry and make it available to EventRewriter.

chrome/browser/ui/views/frame/browser_view.cc

Index: chrome/browser/ui/views/frame/browser_view.cc
diff --git a/chrome/browser/ui/views/frame/browser_view.cc b/chrome/browser/ui/views/frame/browser_view.cc
index 85eea535286486e5c2f3078e294adbc2e8307e27..f010d63d85a7f69f545ce4ce2d4f230220107f36 100644
--- a/chrome/browser/ui/views/frame/browser_view.cc
+++ b/chrome/browser/ui/views/frame/browser_view.cc
@@ -2483,6 +2483,11 @@ void BrowserView::ExecuteExtensionCommand(
   toolbar_->ExecuteExtensionCommand(extension, command);
 }
 
+bool BrowserView::IsExtensionCommandRegistered(
+    const ui::Accelerator& accelerator) {
+  return toolbar_->IsExtensionCommandRegistered(accelerator);
+}
+
 void BrowserView::DoCutCopyPaste(void (WebContents::*method)(),
                                  int command_id) {
   WebContents* contents = browser_->tab_strip_model()->GetActiveWebContents();