[Webview, Child Accounts] Always Google Play Services to show the reauthentication page.

chrome/android/javatests/src/org/chromium/chrome/browser/superviseduser/SupervisedUserContentProviderTest.java

 // 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.chrome.browser.superviseduser;
 
 import android.accounts.Account;
 import android.content.ContentProviderClient;
 import android.content.ContentResolver;
 import android.database.Cursor;
@@ skipping 24 matching lines @@
     private String mAuthority;
     private Uri mUri;
 
     public SupervisedUserContentProviderTest() {
         super(ChromeActivity.class);
     }
 
     @Override
     public void setUp() throws Exception {
         super.setUp();
-        mResolver = getInstrumentation().getContext().getContentResolver();
+        mResolver = getInstrumentation().getTargetContext().getContentResolver();
         assertNotNull(mResolver);
         mAuthority = getInstrumentation().getTargetContext().getPackageName() + AUTHORITY_SUFFIX;
         mUri = new Uri.Builder()
                        .scheme(ContentResolver.SCHEME_CONTENT)
                        .authority(mAuthority)
                        .path("authorized")
                        .build();
         SigninTestUtil.resetSigninState();
     }
 
@@ skipping 59 matching lines @@
         ContentProviderClient client = mResolver.acquireContentProviderClient(mAuthority);
         assertNotNull(client);
         SupervisedUserContentProvider.enableContentProviderForTesting();
         // setFilter for testing sets a default filter that blocks by default.
         mResolver.call(mUri, "setFilterForTesting", null, null);
         Cursor cursor = client.query(mUri, null, "url = 'http://www.google.com'", null, null);
         assertNotNull(cursor);
         assertEquals(WebRestrictionsContentProvider.BLOCKED, cursor.getInt(0));
     }
 }