[Sync] Fix namespaces for the sync_sessions component.

chrome/browser/sync/sync_sessions_metrics_android.h

Index: chrome/browser/sync/sync_sessions_metrics_android.h
diff --git a/chrome/browser/sync/sync_sessions_metrics_android.h b/chrome/browser/sync/sync_sessions_metrics_android.h
deleted file mode 100644
index 1e1682193289dabb31866cd4bb786d834a9a0f0a..0000000000000000000000000000000000000000
--- a/chrome/browser/sync/sync_sessions_metrics_android.h
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_SYNC_SYNC_SESSIONS_METRICS_ANDROID_H_
-#define CHROME_BROWSER_SYNC_SYNC_SESSIONS_METRICS_ANDROID_H_
-
-#include <jni.h>
-
-// Android JNI bridge, java class name is SyncSessionsMetrics.
-class SyncSessionsMetricsAndroid {
- public:
-  static bool Register(JNIEnv* env);
-};
-
-#endif  // CHROME_BROWSER_SYNC_SYNC_SESSIONS_METRICS_ANDROID_H_