Fixes a DCHECK when visiting chrome://theme....

chrome/browser/renderer_host/resource_dispatcher_host_uitest.cc

 // Copyright (c) 2010 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 <sstream>
 #include <string>
 
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/path_service.h"
@@ skipping 299 matching lines @@
   // 1-  http://mock.http/cross-origin-redirect-blocked.html
   // 2-  http://mock.http/redirect-to-title2.html
   // 3-  http://mock.http/title2.html
   //
   // If the redirect in #2 were not blocked, we'd also see a request
   // for http://mock.http:4000/title2.html, and the title would be different.
   CheckTitleTest(L"cross-origin-redirect-blocked.html",
                  L"Title Of More Awesomeness", 2);
 }
 
+// Tests that ResourceDispatcherHostRequestInfo is updated correctly on failed
+// requests, to prevent calling Read on a request that has already failed.
+// See bug 40250.
+TEST_F(ResourceDispatcherTest, CrossSiteFailedRequest) {
+  scoped_refptr<BrowserProxy> browser_proxy(automation()->GetBrowserWindow(0));
+  ASSERT_TRUE(browser_proxy.get());
+  scoped_refptr<TabProxy> tab(browser_proxy->GetActiveTab());
+  ASSERT_TRUE(tab.get());
+
+  // Visit another URL first to trigger a cross-site navigation.
+  GURL url(chrome::kChromeUINewTabURL);
+  ASSERT_EQ(AUTOMATION_MSG_NAVIGATION_SUCCESS, tab->NavigateToURL(url));
+
+  // Visit a URL that fails without calling ResourceDispatcherHost::Read.
+  GURL broken_url("chrome://theme");
+  ASSERT_EQ(AUTOMATION_MSG_NAVIGATION_SUCCESS, tab->NavigateToURL(broken_url));
+
+  // Make sure the navigation finishes.
+  std::wstring tab_title;
+  EXPECT_TRUE(tab->GetTabTitle(&tab_title));
+  EXPECT_EQ(L"chrome://theme/ is not available", tab_title);
+}
+
 }  // namespace