Mark window parameter for chrome.browserAction.openPopup as optional since it is not provided when …

chrome/renderer/resources/extensions/browser_action_custom_bindings.js

Index: chrome/renderer/resources/extensions/browser_action_custom_bindings.js
diff --git a/chrome/renderer/resources/extensions/browser_action_custom_bindings.js b/chrome/renderer/resources/extensions/browser_action_custom_bindings.js
index 9a9fae08eea5eea998faef958d0bc7d7e026d969..9bec48b1303a342c8a346830991c495af266b883 100644
--- a/chrome/renderer/resources/extensions/browser_action_custom_bindings.js
+++ b/chrome/renderer/resources/extensions/browser_action_custom_bindings.js
@@ -19,14 +19,15 @@ binding.registerCustomHook(function(bindingsAPI) {
 
   apiFunctions.setCustomCallback('openPopup',
                                  function(name, request, response) {
-    if (chrome.runtime.lastError)
-      throw new Error(chrome.runtime.lastError.message);
-
     if (!request.callback)
       return;
 
-    var views = getExtensionViews(-1, 'POPUP');
-    request.callback(views.length > 0 ? views[0] : null);
+    if (chrome.runtime.lastError) {
+      request.callback();
+    } else {
+      var views = getExtensionViews(-1, 'POPUP');
+      request.callback(views.length > 0 ? views[0] : null);
+    }
     request.callback = null;
   });
 });