Reland "Android: Remove GetApplicationContext part 2"

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetsLauncher.java

 // 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.
 
 package org.chromium.chrome.browser.ntp.snippets;
 
-import android.content.Context;
-
 import com.google.android.gms.gcm.GcmNetworkManager;
 import com.google.android.gms.gcm.PeriodicTask;
 import com.google.android.gms.gcm.Task;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.Log;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.SuppressFBWarnings;
 import org.chromium.chrome.browser.ChromeBackgroundService;
@@ skipping 26 matching lines @@
     // The instance of SnippetsLauncher currently owned by a C++ SnippetsLauncherAndroid, if any.
     // If it is non-null then the browser is running.
     private static SnippetsLauncher sInstance;
 
     private GcmNetworkManager mScheduler;
 
     private boolean mGCMEnabled = true;
 
     /**
      * Create a SnippetsLauncher object, which is owned by C++.
-     * @param context The app context.
      */
     @VisibleForTesting
     @CalledByNative
-    public static SnippetsLauncher create(Context context) {
+    public static SnippetsLauncher create() {
         if (sInstance != null) {
             throw new IllegalStateException("Already instantiated");
         }
 
-        sInstance = new SnippetsLauncher(context);
+        sInstance = new SnippetsLauncher();
         return sInstance;
     }
 
     /**
      * Called when the C++ counterpart is deleted.
      */
     @VisibleForTesting
     @SuppressFBWarnings("ST_WRITE_TO_STATIC_FROM_INSTANCE_METHOD")
     @CalledByNative
     public void destroy() {
         assert sInstance == this;
         sInstance = null;
     }
 
     /**
      * Returns true if the native browser has started and created an instance of {@link
      * SnippetsLauncher}.
      */
     public static boolean hasInstance() {
         return sInstance != null;
     }
 
-    protected SnippetsLauncher(Context context) {
-        checkGCM(context);
-        mScheduler = GcmNetworkManager.getInstance(context);
+    protected SnippetsLauncher() {
+        checkGCM();
+        mScheduler = GcmNetworkManager.getInstance(ContextUtils.getApplicationContext());
     }
 
-    private boolean canUseGooglePlayServices(Context context) {
+    private boolean canUseGooglePlayServices() {
         return ExternalAuthUtils.getInstance().canUseGooglePlayServices(
-                context, new UserRecoverableErrorHandler.Silent());
+                ContextUtils.getApplicationContext(), new UserRecoverableErrorHandler.Silent());
     }
 
-    private void checkGCM(Context context) {
+    private void checkGCM() {
         // Check to see if Play Services is up to date, and disable GCM if not.
-        if (!canUseGooglePlayServices(context)) {
+        if (!canUseGooglePlayServices()) {
             mGCMEnabled = false;
             Log.i(TAG, "Disabling SnippetsLauncher because Play Services is not up to date.");
         }
     }
 
     private static PeriodicTask buildFetchTask(
             String tag, long periodSeconds, int requiredNetwork) {
         // Add a bit of "flex" around the target period. This achieves the following:
         // - It makes sure the task doesn't run (significantly) before its initial period has
         //   elapsed. In practice, the scheduler seems to behave like that anyway, but it doesn't
@@ skipping 57 matching lines @@
         Log.i(TAG, "Unscheduling");
         return schedule(0, 0);
     }
 
     public static boolean shouldRescheduleTasksOnUpgrade() {
         // Reschedule the periodic tasks if they were enabled previously.
         return ContextUtils.getAppSharedPreferences().getBoolean(PREF_IS_SCHEDULED, false);
     }
 }