Implement the onBeforeRetarget event of the webNavigation API

chrome/browser/extensions/extension_webnavigation_api.h

Index: chrome/browser/extensions/extension_webnavigation_api.h
diff --git a/chrome/browser/extensions/extension_webnavigation_api.h b/chrome/browser/extensions/extension_webnavigation_api.h
index 0f5948e791d15d1b271e2ed6dea24bc45618055a..0ecac0dd339e4918825ba443923378c1203f86b8 100644
--- a/chrome/browser/extensions/extension_webnavigation_api.h
+++ b/chrome/browser/extensions/extension_webnavigation_api.h
@@ -21,6 +21,7 @@
 class NavigationController;
 class ProvisionalLoadDetails;
 class TabContents;
+struct ViewHostMsg_CreateWindow_Params;
 
 // Tracks the navigation state of all frames currently known to the
 // webNavigation API. It is mainly used to track in which frames an error
@@ -121,6 +122,12 @@ class ExtensionWebNavigationEventRouter : public NotificationObserver {
   void FailProvisionalLoadWithError(NavigationController* controller,
                                     ProvisionalLoadDetails* details);
 
+  // Handler for the CREATING_NEW_WINDOW event. The method takes the details of
+  // such an event and constructs a suitable JSON formatted extension event from
+  // it.
+  void CreatingNewWindow(TabContents* tab_content,
+                         const ViewHostMsg_CreateWindow_Params* details);
+
   // Dispatches events to the extension message service.
   void DispatchEvent(Profile* context,
                      const char* event_name,