Fix headless_browsertests failures with PlzNavigate.

headless/lib/headless_browser_context_browsertest.cc

 // Copyright 2016 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 <memory>
 
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/ptr_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_restrictions.h"
@@ skipping 178 matching lines @@
   HeadlessBrowserContext* another_browser_context =
       browser()->CreateBrowserContextBuilder().Build();
 
   // Loading the same non-existent page using a tab with a different context
   // should not work since the protocol handler only exists on the custom
   // context.
   web_contents =
       another_browser_context->CreateWebContentsBuilder()
           .SetInitialURL(GURL("http://not-an-actual-domain.tld/hello.html"))
           .Build();
-  EXPECT_TRUE(WaitForLoad(web_contents));
+  EXPECT_FALSE(WaitForLoad(web_contents));
   EXPECT_TRUE(EvaluateScript(web_contents, "document.body.innerHTML")
                   ->GetResult()
                   ->GetValue()
                   ->GetAsString(&inner_html));
   EXPECT_EQ("", inner_html);
   web_contents->Close();
 }
 
 IN_PROC_BROWSER_TEST_F(HeadlessBrowserTest, UserDataDir) {
   // We do not want to bother with posting tasks to create a temp dir.
@@ skipping 80 matching lines @@
 
   // Verify that the preference takes effect.
   HeadlessWebContentsImpl* contents_impl =
       HeadlessWebContentsImpl::From(web_contents);
   EXPECT_TRUE(contents_impl->web_contents()
                   ->GetRenderViewHost()
                   ->GetWebkitPreferences().hide_scrollbars);
 }
 
 }  // namespace headless