Refactor mixed content checks against the top frame into MixedContentChecker.

Source/modules/websockets/NewWebSocketChannelImpl.cpp

Index: Source/modules/websockets/NewWebSocketChannelImpl.cpp
diff --git a/Source/modules/websockets/NewWebSocketChannelImpl.cpp b/Source/modules/websockets/NewWebSocketChannelImpl.cpp
index a03e4b03da72ad1be0d6c01a38b8b19ba90a457c..53cd59b044667e434acfafe384525ad5d9589ebf 100644
--- a/Source/modules/websockets/NewWebSocketChannelImpl.cpp
+++ b/Source/modules/websockets/NewWebSocketChannelImpl.cpp
@@ -137,9 +137,6 @@ bool NewWebSocketChannelImpl::connect(const KURL& url, const String& protocol)
     if (executionContext()->isDocument() && document()->frame()) {
         if (!document()->frame()->loader().mixedContentChecker()->canConnectInsecureWebSocket(document()->securityOrigin(), url))
             return false;
-        Frame* top = document()->frame()->tree().top();
-        if (top != document()->frame() && !toLocalFrame(top)->loader().mixedContentChecker()->canConnectInsecureWebSocket(toLocalFrame(top)->document()->securityOrigin(), url))
-            return false;
     }
     if (MixedContentChecker::isMixedContent(document()->securityOrigin(), url)) {
         String message = "Connecting to a non-secure WebSocket server from a secure origin is deprecated.";