Keep browser process alive while there are platform apps with background pages running.

chrome/browser/extensions/extension_host_mac.h

Index: chrome/browser/extensions/extension_host_mac.h
diff --git a/chrome/browser/extensions/extension_host_mac.h b/chrome/browser/extensions/extension_host_mac.h
index 9ec2d9aa1ed1b3c5fc072bb5d189d799a28dc1de..324f23173b0b3e56930d1cfd360ce45b1d02c222 100644
--- a/chrome/browser/extensions/extension_host_mac.h
+++ b/chrome/browser/extensions/extension_host_mac.h
@@ -15,9 +15,10 @@ class Extension;
 class ExtensionHostMac : public ExtensionHost {
  public:
   ExtensionHostMac(const extensions::Extension* extension,
+                   Delegate* delegate,
                    content::SiteInstance* site_instance,
                    const GURL& url, chrome::ViewType host_type) :
-      ExtensionHost(extension, site_instance, url, host_type) {}
+      ExtensionHost(extension, delegate, site_instance, url, host_type) {}
   virtual ~ExtensionHostMac();
 
  private: