The first 3 BluetoothTest.* unit tests now running on Mac as well.

device/bluetooth/test/mock_bluetooth_central_manager_mac.mm

Index: device/bluetooth/test/mock_bluetooth_central_manager_mac.mm
diff --git a/device/bluetooth/test/mock_bluetooth_central_manager_mac.mm b/device/bluetooth/test/mock_bluetooth_central_manager_mac.mm
index 0b0f10f0e565d6c058407a2a37f12466b8ae86f9..ca6164c8017650b37ca6a4633b7b925fcd0a1640 100644
--- a/device/bluetooth/test/mock_bluetooth_central_manager_mac.mm
+++ b/device/bluetooth/test/mock_bluetooth_central_manager_mac.mm
@@ -9,6 +9,7 @@
 @synthesize scanForPeripheralsCallCount = _scanForPeripheralsCallCount;
 @synthesize stopScanCallCount = _stopScanCallCount;
 @synthesize delegate = _delegate;
+@synthesize state = _state;
 
 - (instancetype)init {
   _scanForPeripheralsCallCount = 0;
@@ -22,10 +23,6 @@
   return [self init];
 }
 
-- (CBCentralManagerState)state {
-  return CBCentralManagerStatePoweredOn;
-}
-
 - (void)scanForPeripheralsWithServices:(NSArray*)serviceUUIDs
                                options:(NSDictionary*)options {
   _scanForPeripheralsCallCount++;