Observe OnExtensionLoaded to trigger update of chrome.commands keybindings for component extensions.

chrome/browser/extensions/extension_keybinding_registry.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/extension_keybinding_registry.h"
 
 #include "base/values.h"
 #include "chrome/browser/extensions/active_tab_permission_granter.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/command.h"
@@ skipping 179 matching lines @@
 
       const Extension* extension = ExtensionRegistry::Get(browser_context_)
                                        ->enabled_extensions()
                                        .GetByID(payload->extension_id);
       // During install and uninstall the extension won't be found. We'll catch
       // those events above, with the LOADED/UNLOADED, so we ignore this event.
       if (!extension)
         return;
 
       if (ExtensionMatchesFilter(extension)) {
-        if (type == extensions::NOTIFICATION_EXTENSION_COMMAND_ADDED)
+        if (type == extensions::NOTIFICATION_EXTENSION_COMMAND_ADDED) {
+          // Component extensions triggers OnExtensionLoaded for extension
+          // installs as well as loads. This can cause adding of multiple key
+          // targets.
+          if (extension->location() == Manifest::COMPONENT)
+            return;
+
           AddExtensionKeybindings(extension, payload->command_name);
-        else
+        } else {
           RemoveExtensionKeybinding(extension, payload->command_name);
+        }
       }
       break;
     }
     default:
       NOTREACHED();
       break;
   }
 }
 
 bool ExtensionKeybindingRegistry::ExtensionMatchesFilter(
@@ skipping 27 matching lines @@
     if (extension_id.empty() || it->first == extension_id) {
       CommandExecuted(it->first, it->second);
       executed = true;
     }
   }
 
   return executed;
 }
 
 }  // namespace extensions