[Android] Fix crash when closing tab during infobar cancellation

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

Index: chrome/android/java/src/org/chromium/chrome/browser/download/ChromeDownloadDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/ChromeDownloadDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/download/ChromeDownloadDelegate.java
index 7921771a81372d8c25470dd2dacad21928ac22b3..26e1691391d3170f225c49b2c6807f423cf88e02 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/download/ChromeDownloadDelegate.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/ChromeDownloadDelegate.java
@@ -56,15 +56,16 @@ public class ChromeDownloadDelegate implements ContentViewDownloadDelegate {
 
     private class DangerousDownloadListener implements SimpleConfirmInfoBarBuilder.Listener {
         @Override
-        public void onInfoBarButtonClicked(boolean confirm) {
+        public boolean onInfoBarButtonClicked(boolean confirm) {
             assert mTab != null;
-            if (mPendingRequest == null) return;
+            if (mPendingRequest == null) return false;
             if (mPendingRequest.getDownloadGuid() != null) {
                 nativeDangerousDownloadValidated(mTab, mPendingRequest.getDownloadGuid(), confirm);
                 if (confirm) {
                     showDownloadStartNotification();
                 }
-                closeBlankTab();
+                mPendingRequest = null;
+                return closeBlankTab();
             } else if (confirm) {
                 // User confirmed the download.
                 if (mPendingRequest.isGETRequest()) {
@@ -96,13 +97,16 @@ public class ChromeDownloadDelegate implements ContentViewDownloadDelegate {
                     DownloadManagerService.getDownloadManagerService(mContext).onDownloadCompleted(
                             newDownloadInfo);
                 }
+                mPendingRequest = null;
+                return false;
             } else {
                 // User did not accept the download, discard the file if it is a POST download.
                 if (!mPendingRequest.isGETRequest()) {
                     discardFile(mPendingRequest.getFilePath());
                 }
+                mPendingRequest = null;
+                return closeBlankTab();
             }
-            mPendingRequest = null;
         }
 
         @Override