Fix some leaks and failures under valgrind in JS extensions unit tests.

extensions/renderer/api_test_base.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_RENDERER_API_TEST_BASE_H_
 #define EXTENSIONS_RENDERER_API_TEST_BASE_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 56 matching lines @@
 // 2. Write JS tests in extensions/test/data/test_file.js.
 // 3. Write one C++ test function for each JS test containing
 //    RunTest("test_file.js", "testFunctionName").
 // See extensions/renderer/api_test_base_unittest.cc and
 // extensions/test/data/api_test_base_unittest.js for sample usage.
 class ApiTestBase : public ModuleSystemTest {
  protected:
   ApiTestBase();
   virtual ~ApiTestBase();
   virtual void SetUp() OVERRIDE;
+  virtual void TearDown() OVERRIDE;
   void RunTest(const std::string& file_name, const std::string& test_name);
   TestServiceProvider* service_provider() { return service_provider_; }
 
  private:
   void RegisterModules();
   void InitializeEnvironment();
   void RunTestInner(const std::string& test_name,
                     const base::Closure& quit_closure);
   void RunPromisesAgain();
 
   base::MessageLoop message_loop_;
   TestServiceProvider* service_provider_;
   scoped_ptr<V8SchemaRegistry> v8_schema_registry_;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_API_TEST_BASE_H_