Implemented Asynchronous Initialization of BluetoothAdapter.

device/bluetooth/bluetooth_adapter.h

Index: device/bluetooth/bluetooth_adapter.h
diff --git a/device/bluetooth/bluetooth_adapter.h b/device/bluetooth/bluetooth_adapter.h
index 30d7a95f41aadf7711f743b40df0af77ab8da53c..fd7c98337f95caecce81657faefd105f994fb10e 100644
--- a/device/bluetooth/bluetooth_adapter.h
+++ b/device/bluetooth/bluetooth_adapter.h
@@ -79,9 +79,6 @@ class BluetoothAdapter : public base::RefCounted<BluetoothAdapter> {
   typedef base::Callback<void(const BluetoothOutOfBandPairingData& data)>
       BluetoothOutOfBandPairingDataCallback;
 
-  typedef base::Callback<void(scoped_refptr<BluetoothAdapter> adapter)>
-      AdapterCallback;
-
   // Adds and removes observers for events on this bluetooth adapter,
   // if monitoring multiple adapters check the |adapter| parameter of
   // observer methods to determine which adapter is issuing the event.
@@ -96,9 +93,6 @@ class BluetoothAdapter : public base::RefCounted<BluetoothAdapter> {
   // The name of the adapter.
   virtual const std::string& name() const;
 
-  // Queue adapter callbacks to be run when the adapter is initialized.
-  virtual void QueueAdapterCallback(const AdapterCallback& callback);
-
   // Indicates whether the adapter is initialized and ready to use.
   virtual bool IsInitialized() const = 0;
 
@@ -160,8 +154,6 @@ class BluetoothAdapter : public base::RefCounted<BluetoothAdapter> {
   // Name of the adapter.
   std::string name_;
 
-  std::vector<AdapterCallback> adapter_callbacks_;
-
   // Devices paired with, connected to, discovered by, or visible to the
   // adapter. The key is the Bluetooth address of the device and the value
   // is the BluetoothDevice object whose lifetime is managed by the