remove meaningless substitution.

Source/modules/serviceworkers/Request.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "Request.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/fetch/FetchUtils.h"
@@ skipping 10 matching lines @@
 namespace blink {
 
 Request* Request::createRequestWithRequestData(ExecutionContext* context, FetchRequestData* request, const RequestInit& init, WebURLRequest::FetchRequestMode mode, WebURLRequest::FetchCredentialsMode credentials, ExceptionState& exceptionState)
 {
     // "7. Let |mode| be |init|'s mode member if it is present, and
     // |fallbackMode| otherwise."
     // "8. If |mode| is non-null, set |request|'s mode to |mode|."
     if (init.mode == "same-origin") {
         request->setMode(WebURLRequest::FetchRequestModeSameOrigin);
     } else if (init.mode == "no-cors") {
-        request->setMode(mode = WebURLRequest::FetchRequestModeNoCORS);
+        request->setMode(WebURLRequest::FetchRequestModeNoCORS);
     } else if (init.mode == "cors") {
         request->setMode(WebURLRequest::FetchRequestModeCORS);
     } else {
         // Instead of using null as a special fallback value, we pass the
         // current mode in Request::create(). So we just set here.
         request->setMode(mode);
     }
 
     // "9. Let |credentials| be |init|'s credentials member if it is present,
     // and |fallbackCredentials| otherwise."
@@ skipping 288 matching lines @@
 }
 
 void Request::trace(Visitor* visitor)
 {
     Body::trace(visitor);
     visitor->trace(m_request);
     visitor->trace(m_headers);
 }
 
 } // namespace blink