Show a warning when the history files can't be read correctly....

chrome/browser/history/history_backend_unittest.cc

Index: chrome/browser/history/history_backend_unittest.cc
===================================================================
--- chrome/browser/history/history_backend_unittest.cc	(revision 30544)
+++ chrome/browser/history/history_backend_unittest.cc	(working copy)
@@ -32,11 +32,9 @@
 // This just forwards the messages we're interested in to the test object.
 class HistoryBackendTestDelegate : public HistoryBackend::Delegate {
  public:
-  explicit HistoryBackendTestDelegate(HistoryBackendTest* test) : test_(test) {
-  }
+  explicit HistoryBackendTestDelegate(HistoryBackendTest* test) : test_(test) {}
 
-  virtual void NotifyTooNew() {
-  }
+  virtual void NotifyProfileError(int message_id) {}
   virtual void SetInMemoryBackend(InMemoryHistoryBackend* backend);
   virtual void BroadcastNotifications(NotificationType type,
                                       HistoryDetails* details);