Implement first part of supporting global extension commands.

chrome/browser/extensions/extension_keybinding_registry.cc

Index: chrome/browser/extensions/extension_keybinding_registry.cc
diff --git a/chrome/browser/extensions/extension_keybinding_registry.cc b/chrome/browser/extensions/extension_keybinding_registry.cc
index 43ad281e21cc895bb49564a39179c0040a214a04..3ea9c2c8f0454892d9bce480e6df6a6471d35eef 100644
--- a/chrome/browser/extensions/extension_keybinding_registry.cc
+++ b/chrome/browser/extensions/extension_keybinding_registry.cc
@@ -64,9 +64,11 @@ void ExtensionKeybindingRegistry::CommandExecuted(
     return;
 
   // Grant before sending the event so that the permission is granted before
-  // the extension acts on the command.
+  // the extension acts on the command. NOTE: The Global Commands handler does
+  // not set the delegate as it deals only with named commands (not page/browser
+  // actions that are associated with the current page directly).
   ActiveTabPermissionGranter* granter =
-      delegate_->GetActiveTabPermissionGranter();
+      delegate_ ? delegate_->GetActiveTabPermissionGranter() : NULL;
   if (granter)
     granter->GrantIfRequested(extension);