[AF] Add null check to SavePasswordInfoBar

Bug: 1135847
Change-Id: I62aa52b043558bea86d8b3e481d34a4190dc96e9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521697Reviewed-by: Marc Treib <treib@chromium.org>
Commit-Queue: Anne Lim <annelim@google.com>
Cr-Commit-Position: refs/heads/master@{#824989}

chrome/android/java/src/org/chromium/chrome/browser/infobar/SavePasswordInfoBar.java

@@ -54,7 +54,7 @@ public class SavePasswordInfoBar extends ConfirmInfoBar {
 
         if (ChromeFeatureList.isEnabled(
                     ChromeFeatureList.AUTOFILL_ENABLE_PASSWORD_INFO_BAR_ACCOUNT_INDICATION_FOOTER)
-                && !TextUtils.isEmpty(mAccountInfo.getEmail())
+                && mAccountInfo != null && !TextUtils.isEmpty(mAccountInfo.getEmail())
                 && mAccountInfo.getAccountImage() != null) {
             Resources res = layout.getResources();
             int smallIconSize = res.getDimensionPixelSize(R.dimen.infobar_small_icon_size);