MD History: truncate title to 300 chars in C++ instead of JS

chrome/browser/ui/find_bar/find_bar_host_browsertest.cc

 // Copyright (c) 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.
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ skipping 294 matching lines @@
 // Disabled due to crbug.com/175711 and http://crbug.com/419987
 #define MAYBE_SearchWithinSpecialURL \
         DISABLED_SearchWithinSpecialURL
 #else
 #define MAYBE_SearchWithinSpecialURL \
         SearchWithinSpecialURL
 #endif
 IN_PROC_BROWSER_TEST_F(FindInPageControllerTest, MAYBE_SearchWithinSpecialURL) {
   // TODO(tsergeant): Get this test working on MD History, which loads very
   // asynchronously and causes this test to fail.
-  MdHistoryUI::DisableForTesting();
+  MdHistoryUI::SetEnabledForTesting(false);
 
   WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
 
   base::FilePath data_dir =
       ui_test_utils::GetTestFilePath(base::FilePath(), base::FilePath());
   ui_test_utils::NavigateToURL(browser(), net::FilePathToFileURL(data_dir));
   EXPECT_EQ(1, FindInPageASCII(web_contents, "downloads",
                                kFwd, kIgnoreCase, NULL));
 
@@ skipping 1227 matching lines @@
 
   EXPECT_TRUE(chrome::ExecuteCommand(browser_incognito, IDC_FIND_NEXT));
   WebContents* web_contents_incognito =
       browser_incognito->tab_strip_model()->GetActiveWebContents();
   ui_test_utils::FindInPageNotificationObserver observer(
       web_contents_incognito);
   observer.Wait();
   EXPECT_EQ(ASCIIToUTF16("bar"),
             GetFindBarTextForBrowser(browser_incognito));
 }