Rewrite BrowserTest.PageLanguageDetection to use a new tab instead of the one with about:blank.

chrome/browser/browser_browsertest.cc

 // Copyright (c) 2011 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 <string>
 
 #include "base/compiler_specific.h"
 #include "base/file_path.h"
 #include "base/sys_info.h"
 #include "base/utf_string_conversions.h"
@@ skipping 572 matching lines @@
   ASSERT_TRUE(new_browser != browser());
 
   // The browser's app_name should include the app's ID.
   ASSERT_NE(
       new_browser->app_name_.find(extension_app->id()),
       std::string::npos) << new_browser->app_name_;
 }
 #endif
 
 #if defined(OS_WIN)
-// http://crbug.com/46198. On XP/Vista, the failure rate is 5 ~ 6%.
+// http://crbug.com/46198: On XP/Vista, the failure rate is 5 ~ 6%.
 #define MAYBE_PageLanguageDetection FLAKY_PageLanguageDetection
 #else
 #define MAYBE_PageLanguageDetection PageLanguageDetection
 #endif
 // Tests that the CLD (Compact Language Detection) works properly.
 IN_PROC_BROWSER_TEST_F(BrowserTest, MAYBE_PageLanguageDetection) {
   ASSERT_TRUE(test_server()->Start());
 
+  std::string lang;
+
+  // Open a new tab with a page in English.
+  AddTabAtIndex(0, GURL(test_server()->GetURL("files/english_page.html")),
+                PageTransition::TYPED);
+
   TabContents* current_tab = browser()->GetSelectedTabContents();
   TabContentsWrapper* wrapper = browser()->GetSelectedTabContentsWrapper();
   TranslateTabHelper* helper = wrapper->translate_tab_helper();
   Source<TabContents> source(current_tab);
 
-  // Navigate to a page in English.
   ui_test_utils::WindowedNotificationObserverWithDetails<std::string>
       en_language_detected_signal(NotificationType::TAB_LANGUAGE_DETERMINED,
                                   source);
-  ui_test_utils::NavigateToURL(
-      browser(), GURL(test_server()->GetURL("files/english_page.html")));
   EXPECT_TRUE(helper->language_state().original_language().empty());
   en_language_detected_signal.Wait();
-  std::string lang;
   EXPECT_TRUE(en_language_detected_signal.GetDetailsFor(
         source.map_key(), &lang));
   EXPECT_EQ("en", lang);
   EXPECT_EQ("en", helper->language_state().original_language());
 
   // Now navigate to a page in French.
   ui_test_utils::WindowedNotificationObserverWithDetails<std::string>
       fr_language_detected_signal(NotificationType::TAB_LANGUAGE_DETERMINED,
                                   source);
   ui_test_utils::NavigateToURL(
@@ skipping 220 matching lines @@
 
   // The normal browser should now have four.
   EXPECT_EQ(4, browser()->tab_count());
 
   // Close the additional browsers.
   popup_browser->CloseAllTabs();
   app_browser->CloseAllTabs();
   app_popup_browser->CloseAllTabs();
 }
 #endif