Fix Bluetooth Settings activity memory leak.

There were two leaks in Bluetooth Settings: one when rotating the
    phone and other when scanning for bluetooth devices.

src/com/android/settings/ProgressCategory.java

@@ -26,6 +26,7 @@ import java.util.Map;
 public class ProgressCategory extends PreferenceCategory {
 
     private boolean mProgress = false;
+    private View oldView = null;
 
     public ProgressCategory(Context context, AttributeSet attrs) {
         super(context, attrs);
@@ -41,6 +42,13 @@ public class ProgressCategory extends PreferenceCategory {
         int visibility = mProgress ? View.VISIBLE : View.INVISIBLE;
         textView.setVisibility(visibility);
         progressBar.setVisibility(visibility);
+
+        if (oldView != null) {
+            oldView.findViewById(R.id.scanning_progress).setVisibility(View.GONE);
+            oldView.findViewById(R.id.scanning_text).setVisibility(View.GONE);
+            oldView.setVisibility(View.GONE);
+        }
+        oldView = view;
     }
     
     /**

src/com/android/settings/bluetooth/BluetoothSettings.java

@@ -188,7 +188,8 @@ public class BluetoothSettings extends PreferenceActivity
         super.onPause();
 
         mLocalManager.setForegroundActivity(null);
-
+        mDevicePreferenceMap.clear();
+        mDeviceList.removeAll();
         unregisterReceiver(mReceiver);
 
         mLocalManager.unregisterCallback(this);