bluetooth: macOS: BluetoothLowEnergyDeviceMac::IsConnectable() not implemented

Adding NOTIMPLEMENTED() to BluetoothLowEnergyDeviceMac::IsConnectable() and
removing BluetoothLowEnergyDeviceMac::connectable_.

BUG=

Review-Url: https://codereview.chromium.org/2854733002
Cr-Commit-Position: refs/heads/master@{#469458}

device/bluetooth/bluetooth_device.h

@@ -264,7 +264,8 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothDevice {
   virtual bool IsGattConnected() const = 0;
 
   // Indicates whether the paired device accepts connections initiated from the
-  // adapter. This value is undefined for unpaired devices.
+  // adapter. This value is undefined for unpaired devices. Only available for
+  // Chrome OS.
   virtual bool IsConnectable() const = 0;
 
   // Indicates whether there is a call to Connect() ongoing. For this attribute,

device/bluetooth/bluetooth_low_energy_device_mac.h

@@ -140,9 +140,6 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothLowEnergyDeviceMac
   base::scoped_nsobject<BluetoothLowEnergyPeripheralDelegate>
       peripheral_delegate_;
 
-  // Whether the device is connectable.
-  bool connectable_;
-
   // The peripheral's identifier, as returned by [CBPeripheral identifier].
   std::string identifier_;
 

device/bluetooth/bluetooth_low_energy_device_mac.mm

@@ -100,7 +100,9 @@ bool BluetoothLowEnergyDeviceMac::IsGattConnected() const {
 }
 
 bool BluetoothLowEnergyDeviceMac::IsConnectable() const {
-  return connectable_;
+  // Only available for Chrome OS.
+  NOTIMPLEMENTED();
+  return false;
 }
 
 bool BluetoothLowEnergyDeviceMac::IsConnecting() const {