[sensors] Android platform adaptation for Generic Sensor API

device/generic_sensor/platform_sensor_provider_base.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 DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_PROVIDER_BASE_H_
 #define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_PROVIDER_BASE_H_
 
 #include "base/macros.h"
 
 #include "base/threading/non_thread_safe.h"
 #include "device/generic_sensor/platform_sensor.h"
 
 namespace device {
 
 // Base class that defines factory methods for PlatformSensor creation.
 // Its implementations must be accessed via GetInstance() method.
 class PlatformSensorProviderBase : public base::NonThreadSafe {
  public:
-  // Returns the PlatformSensorProviderBase singleton.
-  // Note: returns 'nullptr' if there is no available implementation for
-  // the current platform.
-  static PlatformSensorProviderBase* GetInstance();
-
   // Creates new instance of PlatformSensor.
   scoped_refptr<PlatformSensor> CreateSensor(mojom::SensorType type,
                                              uint64_t size,
                                              uint64_t offset);
 
   // Gets previously created instance of PlatformSensor by sensor type |type|.
   scoped_refptr<PlatformSensor> GetSensor(mojom::SensorType type);
 
   // Shared buffer getters.
   mojo::ScopedSharedBufferHandle CloneSharedBufferHandle();
@@ skipping 17 matching lines @@
  private:
   std::map<mojom::SensorType, PlatformSensor*> sensor_map_;
   mojo::ScopedSharedBufferHandle shared_buffer_handle_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformSensorProviderBase);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_PROVIDER_BASE_H_