Chrome suggestions are no longer served if the user doesn't sync his history on a given machine

chrome/browser/ui/search/search_tab_helper.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 97 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(SearchTabHelperTest,
                            PageURLDoesntBelongToInstantRenderer);
   FRIEND_TEST_ALL_PREFIXES(SearchTabHelperTest,
                            OnChromeIdentityCheckMatch);
   FRIEND_TEST_ALL_PREFIXES(SearchTabHelperTest,
                            OnChromeIdentityCheckMismatch);
   FRIEND_TEST_ALL_PREFIXES(SearchTabHelperTest,
                            OnChromeIdentityCheckSignedOutMatch);
   FRIEND_TEST_ALL_PREFIXES(SearchTabHelperTest,
                            OnChromeIdentityCheckSignedOutMismatch);
+  FRIEND_TEST_ALL_PREFIXES(SearchTabHelperTest,
+                           OnChromeIdentityCheckMatchNotSyncing);
   FRIEND_TEST_ALL_PREFIXES(SearchTabHelperWindowTest,
                            OnProvisionalLoadFailRedirectNTPToLocal);
   FRIEND_TEST_ALL_PREFIXES(SearchTabHelperWindowTest,
                            OnProvisionalLoadFailDontRedirectIfAborted);
   FRIEND_TEST_ALL_PREFIXES(SearchTabHelperWindowTest,
                            OnProvisionalLoadFailDontRedirectNonNTP);
   FRIEND_TEST_ALL_PREFIXES(SearchIPCRouterTest,
                            IgnoreMessageIfThePageIsNotActive);
   FRIEND_TEST_ALL_PREFIXES(SearchIPCRouterTest,
                            DoNotSendSetDisplayInstantResultsMsg);
@@ skipping 103 matching lines @@
 
   // Delegate for notifying our owner about the SearchTabHelper state. Not owned
   // by us.
   // NULL on iOS and Android because they don't use the Instant framework.
   SearchTabHelperDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchTabHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_