Revert "Redirects _blank and window.open() off-origin navigation from PWA to CCT."

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
index a98fb2e45a4551c1b8bc30c0c843d4af3a7ce99b..5ca863096b36d819eac0d67cdd363465992cb0c1 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappActivity.java
@@ -39,7 +39,6 @@ import org.chromium.chrome.browser.tab.EmptyTabObserver;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tab.TabDelegateFactory;
 import org.chromium.chrome.browser.tab.TabObserver;
-import org.chromium.chrome.browser.tabmodel.document.TabDelegate;
 import org.chromium.chrome.browser.util.ColorUtils;
 import org.chromium.chrome.browser.util.UrlUtilities;
 import org.chromium.content.browser.ScreenOrientationProvider;
@@ -715,11 +714,6 @@ public class WebappActivity extends FullScreenActivity {
         return new WebappDelegateFactory(this);
     }
 
-    @Override
-    protected TabDelegate createTabDelegate(boolean incognito) {
-        return new WebappTabDelegate(this, incognito);
-    }
-
     // We're temporarily disable CS on webapp since there are some issues. (http://crbug.com/471950)
     // TODO(changwan): re-enable it once the issues are resolved.
     @Override