🛃 Allow subclasses to use safeExtraCallback.

Bug: 938836
Change-Id: Ib9b4ade4104485f28704f41f8108b93d39c7a5d8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1505556Reviewed-by: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
Reviewed-by: Peter Conn <peconn@chromium.org>
Commit-Queue: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#638127}

chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.java

@@ -1186,7 +1186,7 @@ public class CustomTabsConnection {
      * Wraps calling extraCallback in a try/catch so exceptions thrown by the host app don't crash
      * Chrome. See https://crbug.com/517023.
      */
-    private boolean safeExtraCallback(
+    protected boolean safeExtraCallback(
             CustomTabsSessionToken session, String callbackName, @Nullable Bundle args) {
         CustomTabsCallback callback = mClientManager.getCallbackForSession(session);
         if (callback == null) return false;