[sensors] Close mock sensor stubs after test is finished

third_party/WebKit/Source/modules/sensor/SensorProxy.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 SensorProxy_h
 #define SensorProxy_h
 
 #include "core/dom/ExceptionCode.h"
 #include "device/generic_sensor/public/cpp/sensor_reading.h"
 #include "device/generic_sensor/public/interfaces/sensor.mojom-blink.h"
@@ skipping 63 matching lines @@
 
  private:
   friend class SensorProviderProxy;
   SensorProxy(device::mojom::blink::SensorType, SensorProviderProxy*);
 
   // device::mojom::blink::SensorClient overrides.
   void RaiseError() override;
   void SensorReadingChanged() override;
 
   // Generic handler for a fatal error.
+  // String parameters are intentionally copied.
   void handleSensorError(ExceptionCode = UnknownError,
-                         const String& sanitizedMessage = String(),
-                         const String& unsanitizedMessage = String());
+                         String sanitizedMessage = String(),
+                         String unsanitizedMessage = String());
 
   void onSensorCreated(device::mojom::blink::SensorInitParamsPtr,
                        device::mojom::blink::SensorClientRequest);
 
   bool tryReadFromBuffer();
 
   device::mojom::blink::SensorType m_type;
   device::mojom::blink::ReportingMode m_mode;
   Member<SensorProviderProxy> m_provider;
   using ObserversSet = HeapHashSet<WeakMember<Observer>>;
@@ skipping 12 matching lines @@
   using ReadingBuffer = device::SensorReadingSharedBuffer;
   static_assert(
       sizeof(ReadingBuffer) ==
           device::mojom::blink::SensorInitParams::kReadBufferSizeForTests,
       "Check reading buffer size for tests");
 };
 
 }  // namespace blink
 
 #endif  // SensorProxy_h