[headless] Remove default browser context.

headless/test/headless_browser_test.h

 // 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.
 
 #ifndef HEADLESS_TEST_HEADLESS_BROWSER_TEST_H_
 #define HEADLESS_TEST_HEADLESS_BROWSER_TEST_H_
 
 #include <memory>
 #include <string>
 
@@ skipping 46 matching lines @@
 
  protected:
   HeadlessBrowserTest();
   ~HeadlessBrowserTest() override;
 
   // BrowserTestBase:
   void RunTestOnMainThreadLoop() override;
   void SetUpOnMainThread() override;
   void TearDownOnMainThread() override;
 
-  // Customize the options used in this test. Note that options which take
-  // effect before the message loop has been started (e.g., custom message
-  // pumps) cannot be set via this method.
-  void SetBrowserOptions(HeadlessBrowser::Options options);
-
   // Run an asynchronous test in a nested run loop. The caller should call
   // FinishAsynchronousTest() to notify that the test should finish.
   void RunAsynchronousTest();
 
   // Synchronously waits for a tab to finish loading.
   bool WaitForLoad(HeadlessWebContents* web_contents);
 
   // Synchronously evaluates a script and returns the result.
   std::unique_ptr<runtime::EvaluateResult> EvaluateScript(
       HeadlessWebContents* web_contents,
@@ skipping 26 matching lines @@
   void DevToolsTargetReady() override;
 
   // Implemented by tests and used to send request(s) to DevTools. Subclasses
   // need to ensure that FinishAsynchronousTest() is called after response(s)
   // are processed (e.g. in a callback).
   virtual void RunDevTooledTest() = 0;
 
  protected:
   void RunTest();
 
+  std::unique_ptr<HeadlessBrowserContext> browser_context_;
   HeadlessWebContents* web_contents_;
   std::unique_ptr<HeadlessDevToolsClient> devtools_client_;
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_TEST_HEADLESS_BROWSER_TEST_H_