Merge remote-tracking branch 'origin/5.9' into 5.10.1

Conflicts:
    src/core/web_engine_context.cpp

Change-Id: I004994a0ab6dbc54370b6973de1816cd673154c6

examples/webengine/quicknanobrowser/ApplicationRoot.qml

@@ -55,7 +55,7 @@ QtObject {
     id: root
 
     property QtObject defaultProfile: WebEngineProfile {
-        storageName: "Default"
+        storageName: "Profile"
     }
 
     property QtObject otrProfile: WebEngineProfile {

src/core/browser_context_adapter.cpp

@@ -104,11 +104,11 @@ BrowserContextAdapter::BrowserContextAdapter(const QString &storageName)
 BrowserContextAdapter::~BrowserContextAdapter()
 {
     Q_ASSERT(!m_downloadManagerDelegate);
+    m_browserContext->ShutdownStoragePartitions();
 }
 
 void BrowserContextAdapter::shutdown()
 {
-    m_browserContext->ShutdownStoragePartitions();
     if (m_downloadManagerDelegate) {
         m_browserContext->GetDownloadManager(m_browserContext.data())->Shutdown();
         m_downloadManagerDelegate.reset();

src/core/web_engine_context.cpp

@@ -348,6 +348,9 @@ WebEngineContext::WebEngineContext()
     // The Mojo local-storage is currently pretty broken and saves in $$PWD/Local\ Storage
     parsedCommandLine->AppendSwitch(switches::kDisableMojoLocalStorage);
 
+    // Shared workers are not safe until Chromium 64
+    parsedCommandLine->AppendSwitch(switches::kDisableSharedWorkers);
+
 #if defined(Q_OS_MACOS)
     // Accelerated decoding currently does not work on macOS due to issues with OpenGL Rectangle
     // texture support. See QTBUG-60002.