Continue key propagation for extensions without any listeners to chrome.commands.onCommand.

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 86b9116d0b1fb951c3886dc36f0df7c98b74269f..deeb0a4ed6886fa26127a7ec70e3489051db5d9d 100644
--- a/chrome/browser/extensions/extension_keybinding_registry.cc
+++ b/chrome/browser/extensions/extension_keybinding_registry.cc
@@ -17,6 +17,10 @@
 #include "extensions/common/extension_set.h"
 #include "extensions/common/manifest_constants.h"
 
+namespace {
+const char kOnCommandEventName[] = "commands.onCommand";
+}  // namespace
+
 namespace extensions {
 
 ExtensionKeybindingRegistry::ExtensionKeybindingRegistry(
@@ -115,7 +119,7 @@ void ExtensionKeybindingRegistry::CommandExecuted(
   scoped_ptr<base::ListValue> args(new base::ListValue());
   args->Append(new base::StringValue(command));
 
-  scoped_ptr<Event> event(new Event("commands.onCommand", args.Pass()));
+  scoped_ptr<Event> event(new Event(kOnCommandEventName, args.Pass()));
   event->restrict_to_browser_context = browser_context_;
   event->user_gesture = EventRouter::USER_GESTURE_ENABLED;
   EventRouter::Get(browser_context_)
@@ -234,6 +238,11 @@ bool ExtensionKeybindingRegistry::ExecuteCommands(
   if (targets == event_targets_.end() || targets->second.empty())
     return false;
 
+  if (!extension_id.empty() &&
+      !extensions::EventRouter::Get(browser_context_)
+           ->ExtensionHasEventListener(extension_id, kOnCommandEventName))
+    return false;
+
   bool executed = false;
   for (TargetList::const_iterator it = targets->second.begin();
        it != targets->second.end(); it++) {