Remove the deprecated function ExtensionService::extensions().

chrome/browser/extensions/extension_browsertest.h

 // Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSERTEST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSERTEST_H_
 
 #include <string>
 
 #include "base/command_line.h"
@@ skipping 54 matching lines @@
   }
 
   const std::string& last_loaded_extension_id() {
     return observer_->last_loaded_extension_id();
   }
 
   // Get the profile to use.
   virtual Profile* profile();
 
   static const extensions::Extension* GetExtensionByPath(
-      const extensions::ExtensionSet* extensions, const base::FilePath& path);
+      const extensions::ExtensionSet& extensions,
+      const base::FilePath& path);
 
   // InProcessBrowserTest
   void SetUp() override;
   void SetUpCommandLine(base::CommandLine* command_line) override;
   void SetUpOnMainThread() override;
 
   const extensions::Extension* LoadExtension(const base::FilePath& path);
 
   // Load extension and enable it in incognito mode.
   const extensions::Extension* LoadExtensionIncognito(
@@ skipping 300 matching lines @@
 #endif
 
   // The default profile to be used.
   Profile* profile_;
 
   // Cache cache implementation.
   scoped_ptr<extensions::ExtensionCacheFake> test_extension_cache_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_BROWSERTEST_H_