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Safari blocking extension redirect as "known tracker".
https://webkit.org/b/293881
rdar://problem/152403968

Reviewed by NOBODY (OOPS!).

This was mostly fixed by 296000@main (19746da205f1), however there were a couple of places
that didn't check `redirectedPriorToBlock`. Mainly the console log message saying a known
tracker resource was blocked was being logged to the console erroneously.

Fix this by adding a `shouldBlock()` helper function and using it everywhere `blockedLoad`
was being checked. This ensures consistency in the blocking and console reporting.

Unable to write automated tests due to the nature of known tracker blocking in Safari.

* Source/WebCore/Modules/websockets/ThreadableWebSocketChannel.cpp:
(WebCore::ThreadableWebSocketChannel::validateURL):
* Source/WebCore/contentextensions/ContentExtensionsBackend.cpp:
(WebCore::ContentExtensions::ContentExtensionsBackend::processContentRuleListsForLoad):
* Source/WebCore/contentextensions/ContentRuleListResults.h:
(WebCore::ContentRuleListResults::shouldBlock const):
(WebCore::ContentRuleListResults::shouldNotifyApplication const):
* Source/WebCore/css/StyleSheetContents.cpp:
(WebCore::StyleSheetContents::subresourcesAllowReuse const):
* Source/WebCore/html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::loadResource):
* Source/WebCore/loader/FrameLoader.cpp:
(WebCore::FrameLoader::loadResourceSynchronously):
(WebCore::FrameLoader::prefetchDNSIfNeeded):
* Source/WebCore/loader/LinkLoader.cpp:
(WebCore::LinkLoader::preconnectIfNeeded):
* Source/WebCore/loader/PingLoader.cpp:
(WebCore::processContentRuleListsForLoad):
* Source/WebCore/loader/ResourceLoader.cpp:
(WebCore::ResourceLoader::willSendRequestInternal):
* Source/WebCore/loader/cache/CachedResourceLoader.cpp:
(WebCore::CachedResourceLoader::requestResource):
* Source/WebCore/page/LocalDOMWindow.cpp:
(WebCore::LocalDOMWindow::open):
* Source/WebKit/NetworkProcess/NetworkLoadChecker.cpp:
(WebKit::NetworkLoadChecker::checkRequest):

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