Start delegating notifications to MessageCenter on Windows.

chrome/browser/browser_process.h

Index: chrome/browser/browser_process.h
diff --git a/chrome/browser/browser_process.h b/chrome/browser/browser_process.h
index af1b13ebe66bb57e25e5bb366a966cbd17be65da..942c0b0fed52c18f036b621f9c2ee5a5fab226a9 100644
--- a/chrome/browser/browser_process.h
+++ b/chrome/browser/browser_process.h
@@ -55,6 +55,12 @@ namespace extensions {
 class EventRouterForwarder;
 }
 
+#if defined(ENABLE_MESSAGE_CENTER)
+namespace message_center {
+class MessageCenter;
+}
+#endif
+
 namespace net {
 class URLRequestContextGetter;
 }
@@ -112,6 +118,11 @@ class BrowserProcess {
   // Returns the manager for desktop notifications.
   virtual NotificationUIManager* notification_ui_manager() = 0;
 
+#if defined(ENABLE_MESSAGE_CENTER)
+  // MessageCenter is a global list of currently displayed notifications.
+  virtual message_center::MessageCenter* message_center() = 0;
+#endif
+
   // Returns the state object for the thread that we perform I/O
   // coordination on (network requests, communication with renderers,
   // etc.