Mixed Content: Make MixedContentChecker completely static.

Source/modules/websockets/MainThreadWebSocketChannel.cpp

Index: Source/modules/websockets/MainThreadWebSocketChannel.cpp
diff --git a/Source/modules/websockets/MainThreadWebSocketChannel.cpp b/Source/modules/websockets/MainThreadWebSocketChannel.cpp
index 7ea61b141d1a15a22b372f18c327dbf65de398e9..c706f81296dffd9053b348ffe7203c19311c5791 100644
--- a/Source/modules/websockets/MainThreadWebSocketChannel.cpp
+++ b/Source/modules/websockets/MainThreadWebSocketChannel.cpp
@@ -94,7 +94,7 @@ bool MainThreadWebSocketChannel::connect(const KURL& url, const String& protocol
     ASSERT(!m_handle);
     ASSERT(!m_suspended);
 
-    if (m_document->frame() && !m_document->frame()->loader().mixedContentChecker()->canConnectInsecureWebSocket(m_document->securityOrigin(), url))
+    if (MixedContentChecker::shouldBlockWebSocket(m_document->frame(), url))
         return false;
     if (MixedContentChecker::isMixedContent(m_document->securityOrigin(), url)) {
         String message = "Connecting to a non-secure WebSocket server from a secure origin is deprecated.";