Remove the deprecated function ExtensionService::extensions().

chrome/browser/extensions/test_extension_service.cc

 // 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.
 
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/test_extension_service.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using extensions::Extension;
 
 TestExtensionService::~TestExtensionService() {}
 
-const extensions::ExtensionSet* TestExtensionService::extensions() const {
-  ADD_FAILURE();
-  return NULL;
-}
-
 extensions::PendingExtensionManager*
 TestExtensionService::pending_extension_manager() {
   ADD_FAILURE();
   return NULL;
 }
 
 bool TestExtensionService::UpdateExtension(
     const std::string& id,
     const base::FilePath& path,
     bool file_ownership_passed,
@@ skipping 60 matching lines @@
 void TestExtensionService::UnloadExtension(
     const std::string& extension_id,
     extensions::UnloadedExtensionInfo::Reason reason) {
   ADD_FAILURE();
 }
 
 void TestExtensionService::RemoveComponentExtension(
     const std::string& extension_id) {
   ADD_FAILURE();
 }