Prevent tabs sync during browser shutdown.

chrome/browser/sync/test/integration/sessions_helper.h

Index: chrome/browser/sync/test/integration/sessions_helper.h
diff --git a/chrome/browser/sync/test/integration/sessions_helper.h b/chrome/browser/sync/test/integration/sessions_helper.h
index b1078b496bef734417409ef029191a7ce431fd6e..4e4ba622fd508eeaa5cff26fe215626ab552b205 100644
--- a/chrome/browser/sync/test/integration/sessions_helper.h
+++ b/chrome/browser/sync/test/integration/sessions_helper.h
@@ -87,6 +87,10 @@ bool OpenTab(int index, const GURL& url);
 // size 1, the new tab will be in position 1.
 bool OpenTabAtIndex(int index, int tab_index, const GURL& url);
 
+// Close a tab in the browser at |index| and block until the
+// session model associator is aware of it.
+bool CloseTabAtIndex(int index, int tab_index, const GURL& url);
+
 // Moves the tab in position |tab_index| in the TabStrip for browser at
 // |from_index| to the TabStrip for browser at |to_index|.
 void MoveTab(int from_index, int to_index, int tab_index);
@@ -115,6 +119,10 @@ bool OpenMultipleTabs(int index, const std::vector<GURL>& urls);
 // return until each url in |urls| has been found.
 bool WaitForTabsToLoad(int index, const std::vector<GURL>& urls);
 
+// Wait for a session change to propagate to the model associator.  Will not
+// return until each url in |urls| has been closed.
+bool WaitForTabsToClose(int index, const std::vector<GURL>& urls);
+
 // Check if the session model associator's knows that the current open tab
 // has this url.
 bool ModelAssociatorHasTabWithUrl(int index, const GURL& url);