Revert of [BackgroundSync] Trigger Background Sync events when Chrome is backgrounded on Android

content/public/android/java/src/org/chromium/content/browser/BackgroundSyncNetworkObserver.java

Index: content/public/android/java/src/org/chromium/content/browser/BackgroundSyncNetworkObserver.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/BackgroundSyncNetworkObserver.java b/content/public/android/java/src/org/chromium/content/browser/BackgroundSyncNetworkObserver.java
deleted file mode 100644
index b459b255a7a4584864eab8ccb21d7cf9b8b726e3..0000000000000000000000000000000000000000
--- a/content/public/android/java/src/org/chromium/content/browser/BackgroundSyncNetworkObserver.java
+++ /dev/null
@@ -1,96 +0,0 @@
-// Copyright 2015 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.
-
-package org.chromium.content.browser;
-
-import android.content.Context;
-
-import org.chromium.base.ThreadUtils;
-import org.chromium.base.annotations.CalledByNative;
-import org.chromium.base.annotations.JNINamespace;
-import org.chromium.base.annotations.NativeClassQualifiedName;
-import org.chromium.net.NetworkChangeNotifierAutoDetect;
-
-import java.util.ArrayList;
-import java.util.List;
-
-/**
- * Contains the Java code used by the BackgroundSyncNetworkObserverAndroid C++ class.
- *
- * The purpose of this class is to listen for and forward network connectivity events to the
- * BackgroundSyncNetworkObserverAndroid objects even when the application is paused. The standard
- * NetworkChangeNotifier does not listen for connectivity events when the application is paused.
- *
- * This class maintains a NetworkChangeNotifierAutoDetect, which exists for as long as any
- * BackgroundSyncNetworkObserverAndroid objects are registered.
- *
- * This class lives on the main thread.
- */
-@JNINamespace("content")
-class BackgroundSyncNetworkObserver implements NetworkChangeNotifierAutoDetect.Observer {
-    private static final String TAG = "cr_BgSyncNetObserver";
-
-    private NetworkChangeNotifierAutoDetect mNotifier;
-    private Context mContext;
-
-    // The singleton instance.
-    private static BackgroundSyncNetworkObserver sInstance = null;
-
-    // List of native observers. These are each called when the network state changes.
-    private List<Long> mNativePtrs;
-
-    private BackgroundSyncNetworkObserver(Context ctx) {
-        ThreadUtils.assertOnUiThread();
-        mContext = ctx;
-        mNativePtrs = new ArrayList<Long>();
-    }
-
-    @CalledByNative
-    private static BackgroundSyncNetworkObserver createObserver(Context ctx, long nativePtr) {
-        ThreadUtils.assertOnUiThread();
-        if (sInstance == null) {
-            sInstance = new BackgroundSyncNetworkObserver(ctx);
-        }
-        sInstance.registerObserver(nativePtr);
-        return sInstance;
-    }
-
-    private void registerObserver(final long nativePtr) {
-        ThreadUtils.assertOnUiThread();
-        // Create the NetworkChangeNotifierAutoDetect if it does not exist already.
-        if (mNotifier == null) {
-            mNotifier =
-                    new NetworkChangeNotifierAutoDetect(this, mContext, true /* always listen */);
-        }
-        mNativePtrs.add(nativePtr);
-
-        nativeNotifyConnectionTypeChanged(
-                nativePtr, mNotifier.getCurrentConnectionType(mNotifier.getCurrentNetworkState()));
-    }
-
-    @CalledByNative
-    private void removeObserver(long nativePtr) {
-        ThreadUtils.assertOnUiThread();
-        mNativePtrs.remove(nativePtr);
-        // Destroy the NetworkChangeNotifierAutoDetect if there are no more observers.
-        if (mNativePtrs.size() == 0 && mNotifier != null) {
-            mNotifier.destroy();
-            mNotifier = null;
-        }
-    }
-
-    @Override
-    public void onConnectionTypeChanged(int newConnectionType) {
-        ThreadUtils.assertOnUiThread();
-        for (Long nativePtr : mNativePtrs) {
-            nativeNotifyConnectionTypeChanged(nativePtr, newConnectionType);
-        }
-    }
-
-    @Override
-    public void onMaxBandwidthChanged(double maxBandwidthMbps) {}
-
-    @NativeClassQualifiedName("BackgroundSyncNetworkObserverAndroid::Observer")
-    private native void nativeNotifyConnectionTypeChanged(long nativePtr, int newConnectionType);
-}