Move mojo/public/c/environment/tests to mojo/public/c/tests/environment.

mojo/public/c/tests/environment/async_waiter_perftest_helpers.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 MOJO_PUBLIC_C_ENVIRONMENT_TESTS_ASYNC_WAITER_PERFTEST_HELPERS_H_
-#define MOJO_PUBLIC_C_ENVIRONMENT_TESTS_ASYNC_WAITER_PERFTEST_HELPERS_H_
+#ifndef MOJO_PUBLIC_C_TESTS_ENVIRONMENT_ASYNC_WAITER_PERFTEST_HELPERS_H_
+#define MOJO_PUBLIC_C_TESTS_ENVIRONMENT_ASYNC_WAITER_PERFTEST_HELPERS_H_
 
 #include <mojo/environment/async_waiter.h>
 #include <stdint.h>
 
 #include <functional>
 
 namespace mojo {
 namespace test {
 
 // Basic single-threaded perf test helper for |MojoAsyncWaiter|. This will keep
 // |num_handles| active async waits and activate them one at a time (with each
 // callback triggering the next). This sets up the test (setting up the initial
 // set of async waits), calls |run_loop_function|, and once that is done cleans
 // up. It returns the number of async waits completed. |run_loop_function|
 // should typically run the message/run loop and quit after some fixed amount of
 // time (it should probably measure the actual amount of time spent running, and
 // the return value should probably be normalized with respect to that).
 uint64_t DoAsyncWaiterPerfTest(const MojoAsyncWaiter* async_waiter,
                                uint32_t num_handles,
                                std::function<void()> run_loop_function);
 
 }  // namespace test
 }  // namespace mojo
 
-#endif  // MOJO_PUBLIC_C_ENVIRONMENT_TESTS_ASYNC_WAITER_PERFTEST_HELPERS_H_
+#endif  // MOJO_PUBLIC_C_TESTS_ENVIRONMENT_ASYNC_WAITER_PERFTEST_HELPERS_H_