AndroidSdkDownloader: Do some reformatting

Use #pragma once.
Use Android::Internal namespace.

Change-Id: Ic5ceef259fb2c333448f2ed48a10645d6945c029
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/android/androidsdkdownloader.cpp

@@ -16,12 +16,9 @@
 
 using namespace Utils;
 
-namespace {
-Q_LOGGING_CATEGORY(sdkDownloaderLog, "qtc.android.sdkDownloader", QtWarningMsg)
-}
+namespace { Q_LOGGING_CATEGORY(sdkDownloaderLog, "qtc.android.sdkDownloader", QtWarningMsg) }
 
-namespace Android {
-namespace Internal {
+namespace Android::Internal {
 /**
  * @class SdkDownloader
  * @brief Download Android SDK tools package from within Qt Creator.
@@ -194,5 +191,4 @@ void AndroidSdkDownloader::downloadFinished(QNetworkReply *reply)
     reply->deleteLater();
 }
 
-} // Internal
-} // Android
+} // namespace Android::Internal

src/plugins/android/androidsdkdownloader.h

@@ -1,8 +1,7 @@
 // Copyright (C) 2020 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
 
-#ifndef ANDROIDSDKDOWNLOADER_H
-#define ANDROIDSDKDOWNLOADER_H
+#pragma once
 
 #include "androidconfigurations.h"
 
@@ -15,8 +14,7 @@ class Archive;
 class FilePath;
 }
 
-namespace Android {
-namespace Internal {
+namespace Android::Internal {
 
 class AndroidSdkDownloader : public QObject
 {
@@ -57,7 +55,4 @@ private:
     std::unique_ptr<Utils::Archive> m_archive;
 };
 
-} // Internal
-} // Android
-
-#endif // ANDROIDSDKDOWNLOADER_H
+} // namespace Android::Internal