Fix flaky PPAPITest.FlashClipboard.

ppapi/tests/test_core.cc

 // Copyright (c) 2011 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 "ppapi/tests/test_core.h"
 
-#if defined(_MSC_VER)
-#include <windows.h>
-#else
-#include <unistd.h>
-#endif
-
 #include "ppapi/cpp/core.h"
 #include "ppapi/cpp/module.h"
+#include "ppapi/tests/test_utils.h"
 #include "ppapi/tests/testing_instance.h"
 
-namespace {
-
-void PlatformSleep(int duration_ms) {
-#if defined(_MSC_VER)
-  ::Sleep(duration_ms);
-#else
-  usleep(duration_ms * 1000);
-#endif
-}
-
-}  // namespace
-
 REGISTER_TEST_CASE(Core);
 
 bool TestCore::Init() {
   return true;
 }
 
 void TestCore::RunTest() {
   RUN_TEST(Time);
   RUN_TEST(TimeTicks);
 }
@@ skipping 17 matching lines @@
   ASSERT_TRUE(time1 > 0);
 
   PlatformSleep(100);  // 0.1 second
 
   PP_Time time2 = core->GetTimeTicks();
   ASSERT_TRUE(time2 > time1);
 
   PASS();
 }