Use WTF::crossThreadCopy() in more places

Use WTF::crossThreadCopy() in more places
https://bugs.webkit.org/show_bug.cgi?id=176169

Reviewed by Andreas Kling.

Use WTF::crossThreadCopy() in more places to make code more concise.

Source/WebCore:

* Modules/indexeddb/IDBValue.cpp:
(WebCore::IDBValue::setAsIsolatedCopy):

Source/WebKit:

* UIProcess/WebResourceLoadStatisticsStore.cpp:
(WebKit::WebResourceLoadStatisticsStore::removeDataRecords):
(WebKit::WebResourceLoadStatisticsStore::grandfatherExistingWebsiteData):
(WebKit::WebResourceLoadStatisticsStore::scheduleCookiePartitioningUpdateForDomains):
(WebKit::WebResourceLoadStatisticsStore::updateCookiePartitioning):
(WebKit::WebResourceLoadStatisticsStore::updateCookiePartitioningForDomains):
* UIProcess/WebsiteData/WebsiteDataStore.cpp:
(WebKit::WebsiteDataStore::fetchDataForTopPrivatelyControlledDomains):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@221431 268f45cc-cd09-0410-ab3c-d52691b4dbfc