WebView: prefer ContentUrlConstants over literals

android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java

Index: android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java
diff --git a/android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java b/android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java
index b899420a4d13c4ecd42eefedfcaef5559ebb4bbe..13639965b13af35dfbd356541bb77bcdf66622cb 100644
--- a/android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java
+++ b/android_webview/test/shell/src/org/chromium/android_webview/shell/AwShellActivity.java
@@ -45,6 +45,7 @@ import org.chromium.base.TraceEvent;
 import org.chromium.content.app.ContentApplication;
 import org.chromium.content_public.browser.NavigationController;
 import org.chromium.content_public.browser.WebContents;
+import org.chromium.content_public.common.ContentUrlConstants;
 
 import java.net.URI;
 import java.net.URISyntaxException;
@@ -55,7 +56,7 @@ import java.net.URISyntaxException;
 public class AwShellActivity extends Activity {
     private static final String TAG = "cr.AwShellActivity";
     private static final String PREFERENCES_NAME = "AwShellPrefs";
-    private static final String INITIAL_URL = "about:blank";
+    private static final String INITIAL_URL = ContentUrlConstants.ABOUT_BLANK_DISPLAY_URL;
     private AwBrowserContext mBrowserContext;
     private AwDevToolsServer mDevToolsServer;
     private AwTestContainerView mAwTestContainerView;