chrome: Extract CommandUpdaterDelegate into its own header file.

chrome/browser/ui/browser_command_controller.cc

Index: chrome/browser/ui/browser_command_controller.cc
diff --git a/chrome/browser/ui/browser_command_controller.cc b/chrome/browser/ui/browser_command_controller.cc
index f6ec7f5b1b43f3730b298c2525afae8b6d7402b3..65094759fa995af425fc06a0d3151746f3120684 100644
--- a/chrome/browser/ui/browser_command_controller.cc
+++ b/chrome/browser/ui/browser_command_controller.cc
@@ -282,11 +282,11 @@ void BrowserCommandController::LoadingStateChanged(bool is_loading,
 }
 
 ////////////////////////////////////////////////////////////////////////////////
-// BrowserCommandController,
-//     CommandUpdater::CommandUpdaterDelegate implementation:
+// BrowserCommandController, CommandUpdaterDelegate implementation:
 
 void BrowserCommandController::ExecuteCommandWithDisposition(
-  int id, WindowOpenDisposition disposition) {
+    int id,
+    WindowOpenDisposition disposition) {
   // No commands are enabled if there is not yet any selected tab.
   // TODO(pkasting): It seems like we should not need this, because either
   // most/all commands should not have been enabled yet anyway or the ones that