Prevent NotificationRegistrar from pulling in platform threading stuff.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/3013018

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@53055 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/chrome/browser/tab_contents/tab_contents.cc b/chrome/browser/tab_contents/tab_contents.cc
index 8d4d2e4..73b1b9f 100644
--- a/chrome/browser/tab_contents/tab_contents.cc
+++ b/chrome/browser/tab_contents/tab_contents.cc
@@ -97,6 +97,7 @@
 #include "net/base/net_util.h"
 #include "net/base/registry_controlled_domain.h"
 #include "webkit/glue/webpreferences.h"
+#include "webkit/glue/password_form.h"
 
 // Cross-Site Navigations
 //