bluetooth: Small test improvement

Changes two tests to reset the received events before continuing the
test. This makes it more consistent with other tests and makes it
clearer how the state changes at each point in the tests.

Bug: 896113
Change-Id: I06b963fa0cab0f0a1bf8bb72145711636c77ddae
Reviewed-on: https://chromium-review.googlesource.com/c/1292663Reviewed-by: Ovidio Henriquez <odejesush@chromium.org>
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601747}

services/device/bluetooth/bluetooth_system_unittest.cc

@@ -610,14 +610,14 @@ TEST_F(BluetoothSystemTest, SetPoweredOff_SucceedsAdapterInitiallyOn) {
             GetStateAndWait(system));
   EXPECT_EQ(StateVector({mojom::BluetoothSystem::State::kTransitioning}),
             on_state_changed_states_);
+  ResetResults();
 
   test_bluetooth_adapter_client_->SimulateSetPoweredCompleted(
       kFooObjectPathStr);
 
   EXPECT_EQ(mojom::BluetoothSystem::State::kPoweredOff,
             GetStateAndWait(system));
-  EXPECT_EQ(StateVector({mojom::BluetoothSystem::State::kTransitioning,
-                         mojom::BluetoothSystem::State::kPoweredOff}),
+  EXPECT_EQ(StateVector({mojom::BluetoothSystem::State::kPoweredOff}),
             on_state_changed_states_);
 }
 
@@ -638,13 +638,13 @@ TEST_F(BluetoothSystemTest, SetPoweredOn_SucceedsAdapterInitiallyOff) {
             GetStateAndWait(system));
   EXPECT_EQ(StateVector({mojom::BluetoothSystem::State::kTransitioning}),
             on_state_changed_states_);
+  ResetResults();
 
   test_bluetooth_adapter_client_->SimulateSetPoweredCompleted(
       kFooObjectPathStr);
 
   EXPECT_EQ(mojom::BluetoothSystem::State::kPoweredOn, GetStateAndWait(system));
-  EXPECT_EQ(StateVector({mojom::BluetoothSystem::State::kTransitioning,
-                         mojom::BluetoothSystem::State::kPoweredOn}),
+  EXPECT_EQ(StateVector({mojom::BluetoothSystem::State::kPoweredOn}),
             on_state_changed_states_);
 }