Throw when blocking top-level navigation.

content/browser/site_per_process_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 "content/browser/site_per_process_browsertest.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 3751 matching lines @@
   // frame.  This should fail with a console error message, which should
   // contain the second frame's updated origin (see blink::Frame::canNavigate).
   std::unique_ptr<ConsoleObserverDelegate> console_delegate(
       new ConsoleObserverDelegate(
           shell()->web_contents(),
           "Unsafe JavaScript attempt to initiate navigation*"));
   shell()->web_contents()->SetDelegate(console_delegate.get());
 
   // frames[1] can't be used due to a bug where RemoteFrames are created out of
   // order (https://crbug.com/478792).  Instead, target second frame by name.
-  EXPECT_TRUE(ExecuteScript(
-      root->child_at(0),
-      "parent.frames['frame2'].location.href = 'data:text/html,foo'"));
+  EXPECT_TRUE(ExecuteScript(root->child_at(0),
+                            "try { parent.frames['frame2'].location.href = "
+                            "'data:text/html,foo'; } catch (e) {}"));
   console_delegate->Wait();
 
   std::string frame_origin = root->child_at(1)->current_origin().Serialize();
   EXPECT_EQ(frame_origin + "/", frame_url.GetOrigin().spec());
   EXPECT_TRUE(
       base::MatchPattern(console_delegate->message(), "*" + frame_origin + "*"))
       << "Error message does not contain the frame's latest origin ("
       << frame_origin << ")";
 }
 
@@ skipping 4439 matching lines @@
       " Site A ------------ proxies for B C\n"
       "   +--Site B ------- proxies for A C\n"
       "        +--Site C -- proxies for A B\n"
       "Where A = http://a.com/\n"
       "      B = http://b.com/\n"
       "      C = http://c.com/",
       DepictFrameTree(root));
 }
 
 }  // namespace content