Remove some imports

src/com/owncloud/android/files/services/FileDownloader.java

@@ -28,7 +28,6 @@ import java.util.Vector;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 
-import com.owncloud.android.MainApp;
 import com.owncloud.android.R;
 import com.owncloud.android.authentication.AuthenticatorActivity;
 import com.owncloud.android.datamodel.FileDataStorageManager;

src/com/owncloud/android/files/services/FileUploader.java

@@ -28,7 +28,6 @@ import java.util.Vector;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 
-import com.owncloud.android.MainApp;
 import com.owncloud.android.R;
 import com.owncloud.android.authentication.AuthenticatorActivity;
 import com.owncloud.android.datamodel.FileDataStorageManager;

src/com/owncloud/android/syncadapter/AbstractOwnCloudSyncAdapter.java

@@ -24,7 +24,6 @@ import org.apache.http.HttpRequest;
 import org.apache.http.HttpResponse;
 import org.apache.http.client.ClientProtocolException;
 
-import com.owncloud.android.MainApp;
 import com.owncloud.android.datamodel.FileDataStorageManager;
 import com.owncloud.android.lib.common.accounts.AccountUtils;
 import com.owncloud.android.lib.common.accounts.AccountUtils.AccountNotFoundException;