Remove incorrect DCHECK in RequestOpenURL.

content/browser/frame_host/render_frame_host_manager_browsertest.cc

 // Copyright 2013 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 <stdint.h>
 
 #include <set>
 
 #include "base/command_line.h"
@@ skipping 2670 matching lines @@
   } else {
     // Accessing a property with normal security checks should throw a
     // SecurityError if the same-origin windows are in different processes.
     EXPECT_THAT(result,
                 ::testing::MatchesRegex("SecurityError: Blocked a frame with "
                                         "origin \"http://a.com:\\d+\" from "
                                         "accessing a cross-origin frame."));
   }
 }
 
+// Test coverage for attempts to open subframe links in new windows, to prevent
+// incorrect invariant checks.  See https://crbug.com/605055.
+IN_PROC_BROWSER_TEST_F(RenderFrameHostManagerTest, CtrlClickSubframeLink) {
+  StartEmbeddedServer();
+
+  // Load a page with a subframe link.
+  NavigateToURL(shell(), embedded_test_server()->GetURL(
+                             "/ctrl-click-subframe-link.html"));
+
+  // Simulate a ctrl click on the link.  This won't actually create a new Shell
+  // because Shell::OpenURLFromTab only supports CURRENT_TAB, but it's enough to
+  // trigger the crash from https://crbug.com/605055.
+  EXPECT_TRUE(
+      ExecuteScript(shell()->web_contents(),
+                    "window.domAutomationController.send(ctrlClickLink());"));
+}
+
 }  // namespace content