Using UrlConstants instead of hardcoded values in few places

chrome/android/java/src/org/chromium/chrome/browser/contextualsearch/ContextualSearchManager.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.text.TextUtils;
 import android.view.View;
 import android.view.ViewGroup;
 import android.view.ViewTreeObserver;
 import android.view.ViewTreeObserver.OnGlobalFocusChangeListener;
 
 import org.chromium.base.ObserverList;
 import org.chromium.base.SysUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
+import org.chromium.chrome.browser.UrlConstants;
 import org.chromium.chrome.browser.compositor.bottombar.OverlayContentDelegate;
 import org.chromium.chrome.browser.compositor.bottombar.OverlayPanel.PanelState;
 import org.chromium.chrome.browser.compositor.bottombar.OverlayPanel.StateChangeReason;
 import org.chromium.chrome.browser.compositor.bottombar.OverlayPanelContentViewDelegate;
 import org.chromium.chrome.browser.compositor.bottombar.contextualsearch.ContextualSearchPanel;
 import org.chromium.chrome.browser.contextualsearch.ContextualSearchBlacklist.BlacklistReason;
 import org.chromium.chrome.browser.contextualsearch.ContextualSearchSelectionController.SelectionType;
 import org.chromium.chrome.browser.externalnav.ExternalNavigationHandler;
 import org.chromium.chrome.browser.externalnav.ExternalNavigationHandler.OverrideUrlLoadingResult;
 import org.chromium.chrome.browser.externalnav.ExternalNavigationParams;
@@ skipping 38 matching lines @@
                                                 ContextualSearchNetworkCommunicator,
                                                 ContextualSearchSelectionHandler, SelectionClient {
     private static final String INTENT_URL_PREFIX = "intent:";
 
     // The animation duration of a URL being promoted to a tab when triggered by an
     // intercept navigation. This is faster than the standard tab promotion animation
     // so that it completes before the navigation.
     private static final long INTERCEPT_NAVIGATION_PROMOTION_ANIMATION_DURATION_MS = 40;
 
     // We blacklist this URL because malformed URLs may bring up this page.
-    private static final String BLACKLISTED_URL = "about:blank";
+    private static final String BLACKLISTED_URL = UrlConstants.ABOUT_BLANK_DISPLAY_URL;
 
     private static final Pattern CONTAINS_WHITESPACE_PATTERN = Pattern.compile("\\s");
 
     // When we don't need to send any "home country" code we can just pass the empty string.
     private static final String NO_HOME_COUNTRY = "";
 
     private final ObserverList<ContextualSearchObserver> mObservers =
             new ObserverList<ContextualSearchObserver>();
 
     private final ChromeActivity mActivity;
@@ skipping 1360 matching lines @@
     private native void nativeStartSearchTermResolutionRequest(long nativeContextualSearchManager,
             ContextualSearchContext contextualSearchContext, WebContents baseWebContents);
     protected native void nativeGatherSurroundingText(long nativeContextualSearchManager,
             ContextualSearchContext contextualSearchContext, WebContents baseWebContents);
     private native void nativeEnableContextualSearchJsApiForOverlay(
             long nativeContextualSearchManager, WebContents overlayWebContents);
     // Don't call these directly, instead call the private methods that cache the results.
     private native String nativeGetTargetLanguage(long nativeContextualSearchManager);
     private native String nativeGetAcceptLanguages(long nativeContextualSearchManager);
 }