Remove webContents check when download starts

chrome/android/java/src/org/chromium/chrome/browser/download/DownloadController.java

 // Copyright 2012 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.download;
 
 import android.Manifest.permission;
 import android.app.Activity;
 import android.content.DialogInterface;
 import android.content.pm.PackageManager;
 import android.support.v7.app.AlertDialog;
 import android.view.View;
 import android.widget.TextView;
 
 import org.chromium.base.ApplicationStatus;
+import org.chromium.base.ContextUtils;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
+import org.chromium.chrome.browser.tab.Tab;
+import org.chromium.chrome.browser.tabmodel.TabModelSelector;
+import org.chromium.content_public.browser.WebContents;
 import org.chromium.ui.base.WindowAndroid;
 import org.chromium.ui.base.WindowAndroid.PermissionCallback;
 
 /**
  * Java counterpart of android DownloadController.
  *
  * Its a singleton class instantiated by the C++ DownloadController.
  */
 public class DownloadController {
     private static final String LOGTAG = "DownloadController";
@@ skipping 150 matching lines @@
                                 })
                         .setOnCancelListener(new DialogInterface.OnCancelListener() {
                             @Override
                             public void onCancel(DialogInterface dialog) {
                                 nativeOnAcquirePermissionResult(callbackId, false, null);
                             }
                         });
         builder.create().show();
     }
 
+    /**
+     * Called when a download is started.
+     */
+    @CalledByNative
+    private void onDownloadStarted() {
+        DownloadUtils.showDownloadStartToast(ContextUtils.getApplicationContext());
+    }
+
+    /**
+     * Close a tab if it is blank. Returns true if it is or already closed.
+     * @param Tab Tab to close.
+     * @return true iff the tab was (already) closed.
+     */
+    @CalledByNative
+    static boolean closeTabIfBlank(Tab tab) {
+        if (tab == null) return true;
+        WebContents contents = tab.getWebContents();
+        boolean isInitialNavigation = contents == null
+                || contents.getNavigationController().isInitialNavigation();
+        if (isInitialNavigation) {
+            // Tab is created just for download, close it.
+            TabModelSelector selector = tab.getTabModelSelector();
+            if (selector == null) return true;
+            if (selector.getModel(tab.isIncognito()).getCount() == 1) return false;
+            boolean closed = selector.closeTab(tab);
+            assert closed;
+            return true;
+        }
+        return false;
+    }
+
     // native methods
     private native void nativeInit();
     private native void nativeOnAcquirePermissionResult(
             long callbackId, boolean granted, String permissionToUpdate);
 }