Allow overriding of X error functions

chrome/browser/browser_shutdown.h

Index: chrome/browser/browser_shutdown.h
diff --git a/chrome/browser/browser_shutdown.h b/chrome/browser/browser_shutdown.h
index c2e38b59ea6a25ec4c28a51807573cb72921597d..0df2919ba863a53f697a616deaa8cd68a973a791 100644
--- a/chrome/browser/browser_shutdown.h
+++ b/chrome/browser/browser_shutdown.h
@@ -66,6 +66,11 @@ void SetTryingToQuit(bool quitting);
 // General accessor.
 bool IsTryingToQuit();
 
+// This is true on X during an END_SESSION, when we can no longer depend
+// on the X server to be running. As a result we don't explicitly close the
+// browser windows, which can lead to conditions which would fail checks.
+bool ShuttingDownWithoutClosingBrowsers();
+
 }  // namespace browser_shutdown
 
 #endif  // CHROME_BROWSER_BROWSER_SHUTDOWN_H__