Revert of [DeviceService] Add service tests for VibrationManager.

device/vibration/vibration_manager_impl_default.cc

Index: device/vibration/vibration_manager_impl_default.cc
diff --git a/device/vibration/vibration_manager_impl_default.cc b/device/vibration/vibration_manager_impl_default.cc
index c073f69a1f0fecfc80974aee551ff36af7cf822d..642ddbb75161cf868ff32f51c6a18561b22d5c3e 100644
--- a/device/vibration/vibration_manager_impl_default.cc
+++ b/device/vibration/vibration_manager_impl_default.cc
@@ -11,9 +11,6 @@
 
 namespace device {
 
-int64_t VibrationManagerImpl::milli_seconds_for_testing_ = -1;
-bool VibrationManagerImpl::cancelled_for_testing_ = false;
-
 namespace {
 
 class VibrationManagerEmptyImpl : public mojom::VibrationManager {
@@ -22,14 +19,10 @@
   ~VibrationManagerEmptyImpl() override {}
 
   void Vibrate(int64_t milliseconds, const VibrateCallback& callback) override {
-    VibrationManagerImpl::milli_seconds_for_testing_ = milliseconds;
     callback.Run();
   }
 
-  void Cancel(const CancelCallback& callback) override {
-    VibrationManagerImpl::cancelled_for_testing_ = true;
-    callback.Run();
-  }
+  void Cancel(const CancelCallback& callback) override { callback.Run(); }
 };
 
 }  // namespace