Track the active ExtensionKeybindingRegistry and make it available to EventRewriter.

chrome/test/base/test_browser_window.h

Index: chrome/test/base/test_browser_window.h
diff --git a/chrome/test/base/test_browser_window.h b/chrome/test/base/test_browser_window.h
index c2b6b863769433d68651d58c17bb91221b863916..112af4c41ba77c6d514095dafea397ae967c58ad 100644
--- a/chrome/test/base/test_browser_window.h
+++ b/chrome/test/base/test_browser_window.h
@@ -157,6 +157,8 @@ class TestBrowserWindow : public BrowserWindow {
   virtual void ExecuteExtensionCommand(
       const extensions::Extension* extension,
       const extensions::Command& command) OVERRIDE;
+  virtual bool IsExtensionCommandRegistered(
+      const ui::Accelerator& accelerator) OVERRIDE;
 
  protected:
   virtual void DestroyBrowser() OVERRIDE {}