[Fetch API] Reflect spec changes of bodyUsed property

third_party/WebKit/Source/modules/serviceworkers/RespondWithObserver.cpp

Index: third_party/WebKit/Source/modules/serviceworkers/RespondWithObserver.cpp
diff --git a/third_party/WebKit/Source/modules/serviceworkers/RespondWithObserver.cpp b/third_party/WebKit/Source/modules/serviceworkers/RespondWithObserver.cpp
index 8eecaab106c2805e763df6896aa5177558fe03e7..afd50ec81eff514ed5942ea05a9dc39a030252d0 100644
--- a/third_party/WebKit/Source/modules/serviceworkers/RespondWithObserver.cpp
+++ b/third_party/WebKit/Source/modules/serviceworkers/RespondWithObserver.cpp
@@ -57,6 +57,9 @@ const String getMessageForResponseError(WebServiceWorkerResponseError error, con
     case WebServiceWorkerResponseErrorResponseTypeOpaqueRedirect:
         errorMessage = errorMessage + "an \"opaqueredirect\" type response was used for a request which is not a navigation request.";
         break;
+    case WebServiceWorkerResponseErrorBodyLocked:
+        errorMessage = errorMessage + "a Response whose \"body\" is locked cannot be used to respond to a request.";
+        break;
     case WebServiceWorkerResponseErrorUnknown:
     default:
         errorMessage = errorMessage + "an unexpected error occurred.";
@@ -226,8 +229,11 @@ void RespondWithObserver::responseWasFulfilled(const ScriptValue& value)
         responseWasRejected(WebServiceWorkerResponseErrorBodyUsed);
         return;
     }
+    if (response->isBodyLocked()) {
+        responseWasRejected(WebServiceWorkerResponseErrorBodyLocked);
+        return;
+    }
 
-    response->setBodyPassed();
     WebServiceWorkerResponse webResponse;
     response->populateWebServiceWorkerResponse(webResponse);
     BodyStreamBuffer* buffer = response->internalBodyBuffer();