Make the WebSocket handshake ourselves to ease switching libs

We need to switch to tungstenite to finally update openssl, this commit
rewrites the whole websocket infrastructure to properly follow the Fetch
spec and to make switching to a different websocket library easier.

components/net/fetch/methods.rs

@@ -527,7 +527,7 @@ fn is_null_body_status(status: &Option<StatusCode>) -> bool {
 }
 
 /// https://fetch.spec.whatwg.org/#should-response-to-request-be-blocked-due-to-nosniff?
-fn should_be_blocked_due_to_nosniff(request_type: Type, response_headers: &Headers) -> bool {
+pub fn should_be_blocked_due_to_nosniff(request_type: Type, response_headers: &Headers) -> bool {
     /// https://fetch.spec.whatwg.org/#x-content-type-options-header
     /// This is needed to parse `X-Content-Type-Options` according to spec,
     /// which requires that we inspect only the first value.

components/net/http_loader.rs

@@ -1359,7 +1359,7 @@ fn response_needs_revalidation(_response: &Response) -> bool {
 }
 
 /// https://fetch.spec.whatwg.org/#redirect-status
-fn is_redirect_status(status: StatusCode) -> bool {
+pub fn is_redirect_status(status: StatusCode) -> bool {
     match status {
         StatusCode::MovedPermanently |
         StatusCode::Found |

components/net/resource_thread.rs

@@ -355,6 +355,9 @@ impl CoreResourceManager {
                          connect: WebSocketCommunicate,
                          connect_data: WebSocketConnectData,
                          resource_grp: &ResourceGroup) {
-        websocket_loader::init(connect, connect_data, resource_grp.cookie_jar.clone());
+        websocket_loader::init(connect,
+                               connect_data,
+                               resource_grp.cookie_jar.clone(),
+                               resource_grp.ssl_context.clone());
     }
 }