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

chrome/browser/history/history_backend_unittest.cc

 // Copyright (c) 2009 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.
 
 #include "app/gfx/codec/jpeg_codec.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/scoped_ptr.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
@@ skipping 14 matching lines @@
 // harder than calling it directly for many things.
 
 namespace history {
 
 class HistoryBackendTest;
 
 // This must be a separate object since HistoryBackend manages its lifetime.
 // 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);
   virtual void DBLoaded();
 
  private:
   // Not owned by us.
   HistoryBackendTest* test_;
 
   DISALLOW_EVIL_CONSTRUCTORS(HistoryBackendTestDelegate);
@@ skipping 507 matching lines @@
 
   // If the URL is bookmarked, it should get added to history with 0 visits.
   bookmark_model_.AddURL(bookmark_model_.GetBookmarkBarNode(), 0,
                          std::wstring(), url3);
   backend_->SetImportedFavicons(favicons);
   EXPECT_FALSE(backend_->db_->GetRowForURL(url3, &url_row3) == 0);
   EXPECT_TRUE(url_row3.visit_count() == 0);
 }
 
 }  // namespace history