[Webkit-unassigned] [Bug 237917] [WPE][GTK] Fix a crash after r290360

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237917

--- Comment #1 from Pablo Saavedra <psaavedra at igalia.com> ---
The segfault is because a doble-call to the WebProcess::terminate() method in the WebProcess::shutdown() path.


```
void WebProcess::terminate()
{
#ifndef NDEBUG
    GCController::singleton().garbageCollectNow();
    FontCache::singleton().invalidate();
    MemoryCache::singleton().setDisabled(true);
#endif

    m_webConnection->invalidate(); <<<<<<<< invalid access during the second invocation 
    m_webConnection = nullptr; <<<<<<<<< set null in the first invocation

    platformTerminate();

    AuxiliaryProcess::terminate();
}

```

Here the stack method calls:

AuxiliaryProcess::shutDown():

```
-> terminate()
   -> WebProcess::terminate()
      -> AuxiliaryProcess::terminate()
         -> AuxiliaryProcess::terminate() -> stopRunLoop()
            -> WebProcess::stopRunLoop() (from glib/WebProcessGLib.cpp)
               -> WebPage::close()
                  -> WebProcess::singleton().removeWebPage(m_identifier)
                     -> AuxiliaryProcess::enableTermination() -- m_terminationCounter: 0
                        -> WebProcess::terminate()
```

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