[Android] Simplify "network predictions" preference to a boolean value.

chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchPolicy.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.contextualsearch;
 
 import android.content.Context;
 import android.text.TextUtils;
 
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.browser.ChromeVersionInfo;
 import org.chromium.chrome.browser.contextualsearch.ContextualSearchSelectionController.SelectionType;
 import org.chromium.chrome.browser.preferences.ChromePreferenceManager;
-import org.chromium.chrome.browser.preferences.NetworkPredictionOptions;
 import org.chromium.chrome.browser.preferences.PrefServiceBridge;
 import org.chromium.content.browser.ContentViewCore;
 
 import java.net.URL;
 import java.util.List;
 import java.util.Locale;
 import java.util.regex.Pattern;
 
 import javax.annotation.Nullable;
 
@@ skipping 67 matching lines @@
     boolean isTapSupported() {
         if (!isUserUndecided()) return true;
         return getPromoTapsRemaining() != 0;
     }
 
     /**
      * @return whether or not the Contextual Search Result should be preloaded before the user
      *         explicitly interacts with the feature.
      */
     boolean shouldPrefetchSearchResult(boolean isTapTriggered) {
-        if (PrefServiceBridge.getInstance().getNetworkPredictionOptions()
-                == NetworkPredictionOptions.NETWORK_PREDICTION_NEVER) {
+        if (!PrefServiceBridge.getInstance().getNetworkPredictionEnabled()) {
             return false;
         }
 
         // We may not be prefetching due to the resolve/prefetch limit.
         if (isTapBeyondTheLimit()) return false;
 
         // We never preload on long-press so users can cut & paste without hitting the servers.
         return isTapTriggered;
     }
 
@@ skipping 419 matching lines @@
     }
 
     private int getTapLimitForUndecided() {
         if (mTapLimitForUndecided != null) {
             return mTapLimitForUndecided.intValue();
         } else {
             return TAP_RESOLVE_PREFETCH_LIMIT_FOR_UNDECIDED;
         }
     }
 }