[NTP Snippets] Fetcher: remove |overwrite| param

chrome/android/javatests/src/org/chromium/chrome/browser/ChromeBackgroundServiceTest.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;
 
 import android.content.Context;
 import android.test.InstrumentationTestCase;
 import android.test.suitebuilder.annotation.SmallTest;
 
@@ skipping 38 matching lines @@
     }
 
     static class MockSnippetsController extends SnippetsController {
         private boolean mDidFetchSnippets = false;
 
         MockSnippetsController() {
             super(null);
         }
 
         @Override
-        public void fetchSnippets(boolean overwrite) {
+        public void fetchSnippets() {
             mDidFetchSnippets = true;
         }
 
         protected void checkExpectations(final boolean expectedFetchSnippets) {
             ThreadUtils.runOnUiThread(new Runnable() {
                 @Override
                 public void run() {
                     assertEquals("FetchedSnippets", expectedFetchSnippets, mDidFetchSnippets);
                 }
             });
@@ skipping 48 matching lines @@
         startOnRunTaskAndVerify(SnippetsLauncher.TASK_TAG, false, true);
     }
 
     @SmallTest
     @Feature({"NTPSnippets"})
     public void testNTPSnippetsLaunchBrowserWhenInstanceDoesNotExist() {
         deleteSnippetsLauncherInstance();
         startOnRunTaskAndVerify(SnippetsLauncher.TASK_TAG, true, true);
     }
 }