Null-check the dialog delegate in the modal permission dialog dismiss handler.

chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogController.java

Index: chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogController.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogController.java b/chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogController.java
index d2f5e5a01a55c916d717327bdad0371d874c7b1c..194e8e06a18854d9f80b2c9507b9f46a1abb2320 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogController.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/permissions/PermissionDialogController.java
@@ -191,6 +191,11 @@ public class PermissionDialogController implements AndroidPermissionRequester.Re
         mDialog.setOnDismissListener(new DialogInterface.OnDismissListener() {
             @Override
             public void onDismiss(DialogInterface dialog) {
+                // For some reason this is ocassionally null. See crbug.com/708562.
+                if (mDialogDelegate == null) {
+                    scheduleDisplay();

[Timothy Loh, 2017/05/10 07:38:37]

Was there supposed to be a return here?

[dominickn, 2017/05/10 08:42:15]

Hmmmmmmm.... yes. I think so. Oops.

+                }
+
                 mDialog = null;
                 if (mDecision == ACCEPTED) {
                     // Request Android permissions if necessary. This will call back into either