RFR: 8264990: Fix segfault when accessing local storage in webview

[Matthias Bläsing]

On Fri, 9 Apr 2021 13:18:21 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> To follow up on my earlier comment, if I move `LocalStorageAccess.html` to `tests/system/src/testapp7/resources/mymod/myapp7/` and remove the `/` from the program that loads it, the test is able to load the resource. And I verified that the test fails without your fix and passes with your fix.
>
> The bug is now available in the JDK project in JBS:
> https://bugs.openjdk.java.net/browse/JDK-8264990

@kevinrushforth @johanvos thank you both for review/checking. I pushed an update, that addresses the comments and updated the issue with the final issue id. I did not touch the comments on the original commits, so that history is kept intact (I understand, that skara bot will use the PR message as base for the final squashed commit and ignores the individual commits)

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PR: https://git.openjdk.java.net/jfx/pull/458