Fix browser tests on Mac

headless/lib/browser/headless_web_contents_impl.cc

 // Copyright 2015 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 "headless/lib/browser/headless_web_contents_impl.h"
 
 #include <string>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 186 matching lines @@
   }
 }
 
 bool HeadlessWebContentsImpl::OpenURL(const GURL& url) {
   if (!url.is_valid())
     return false;
   content::NavigationController::LoadURLParams params(url);
   params.transition_type = ui::PageTransitionFromInt(
       ui::PAGE_TRANSITION_TYPED | ui::PAGE_TRANSITION_FROM_ADDRESS_BAR);
   web_contents_->GetController().LoadURLWithParams(params);
+  web_contents_delegate_->ActivateContents(web_contents_.get());
   web_contents_->Focus();
   return true;
 }
 
 void HeadlessWebContentsImpl::Close() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   browser_context()->DestroyWebContents(this);
 }
 
 std::string HeadlessWebContentsImpl::GetDevToolsAgentHostId() {
@@ skipping 101 matching lines @@
 HeadlessWebContents::Builder::MojoService::MojoService() {}
 
 HeadlessWebContents::Builder::MojoService::MojoService(
     const std::string& service_name,
     const base::Callback<void(mojo::ScopedMessagePipeHandle)>& service_factory)
     : service_name(service_name), service_factory(service_factory) {}
 
 HeadlessWebContents::Builder::MojoService::~MojoService() {}
 
 }  // namespace headless