headless: Introduce a browser context

headless/lib/headless_devtools_client_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 "content/public/test/browser_test.h"
 #include "headless/public/domains/network.h"
 #include "headless/public/domains/page.h"
 #include "headless/public/domains/runtime.h"
@@ skipping 26 matching lines @@
   void DevToolsTargetReady() override {
     EXPECT_TRUE(web_contents_->GetDevToolsTarget());
     web_contents_->GetDevToolsTarget()->AttachClient(devtools_client_.get());
     RunDevToolsClientTest();
   }
 
   virtual void RunDevToolsClientTest() = 0;
 
  protected:
   void RunTest() {
-    web_contents_ =
-        browser()->CreateWebContents(GURL("about:blank"), gfx::Size(800, 600));
+    web_contents_ = browser()->CreateWebContentsBuilder().Build();
     web_contents_->AddObserver(this);
 
     RunAsynchronousTest();
 
     web_contents_->GetDevToolsTarget()->DetachClient(devtools_client_.get());
     web_contents_->RemoveObserver(this);
     web_contents_->Close();
     web_contents_ = nullptr;
   }
 
@@ skipping 147 matching lines @@
 
   void OnFrameStoppedLoading(
       const page::FrameStoppedLoadingParams& params) override {
     FinishAsynchronousTest();
   }
 };
 
 DEVTOOLS_CLIENT_TEST_F(HeadlessDevToolsClientExperimentalTest);
 
 }  // namespace headless