Revert of Simplify BrowserContext by removing redundant methods.

extensions/browser/api_unittest.h

 // Copyright 2014 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 EXTENSIONS_BROWSER_API_UNITTEST_H_
 #define EXTENSIONS_BROWSER_API_UNITTEST_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 31 matching lines @@
   content::WebContents* contents() { return contents_.get(); }
   const Extension* extension() const { return extension_.get(); }
   scoped_refptr<Extension> extension_ref() { return extension_; }
   void set_extension(scoped_refptr<Extension> extension) {
     extension_ = extension;
   }
 
  protected:
   // SetUp creates and loads an empty, unpacked Extension.
   void SetUp() override;
-  void TearDown() override;
 
   // Creates a background page for |extension_|, and sets it for the WebContents
   // to be used in API calls.
   // If |contents_| is already set, this does nothing.
   void CreateBackgroundPage();
 
   // Various ways of running an API function. These methods take ownership of
   // |function|. |args| should be in JSON format, wrapped in a list.
   // See also the RunFunction* methods in extension_function_test_utils.h.
 
@@ skipping 33 matching lines @@
   // or null.
   scoped_ptr<content::WebContents> contents_;
 
   // The Extension used when running API function calls.
   scoped_refptr<Extension> extension_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_API_UNITTEST_H_