Reland "Android: Remove GetApplicationContext part 2"

base/android/java/src/org/chromium/base/MemoryPressureListener.java

 // Copyright 2013 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.base;
 
 import android.app.Activity;
 import android.content.ComponentCallbacks2;
-import android.content.Context;
 import android.content.res.Configuration;
 
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.MainDex;
 
 
 /**
  * This is an internal implementation of the C++ counterpart.
  * It registers a ComponentCallbacks2 with the system, and dispatches into
  * native for levels that are considered actionable.
@@ skipping 20 matching lines @@
             "org.chromium.base.ACTION_TRIM_MEMORY_RUNNING_CRITICAL";
 
     /**
      * Sending an intent with this action to Chrome will cause it to issue a call to onTrimMemory
      * with notification level TRIM_MEMORY_MODERATE thus simulating a low memory situation
      */
     private static final String ACTION_TRIM_MEMORY_MODERATE =
             "org.chromium.base.ACTION_TRIM_MEMORY_MODERATE";
 
     @CalledByNative
-    private static void registerSystemCallback(Context context) {
-        context.registerComponentCallbacks(
+    private static void registerSystemCallback() {
+        ContextUtils.getApplicationContext().registerComponentCallbacks(
                 new ComponentCallbacks2() {
                     @Override
                     public void onTrimMemory(int level) {
                         maybeNotifyMemoryPresure(level);
                     }
 
                     @Override
                     public void onLowMemory() {
                         nativeOnMemoryPressure(MemoryPressureLevel.CRITICAL);
                     }
@@ skipping 47 matching lines @@
     private static void simulateTrimMemoryPressureSignal(Activity activity, int level) {
         // The Application and the Activity each have a list of callbacks they notify when this
         // method is called.  Notifying these will simulate the event at the App/Activity level
         // as well as trigger the listener bound from native in this process.
         activity.getApplication().onTrimMemory(level);
         activity.onTrimMemory(level);
     }
 
     private static native void nativeOnMemoryPressure(int memoryPressureType);
 }