Reflect method restriction removal from Fetch API on data URL

third_party/WebKit/Source/modules/fetch/FetchManager.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 "modules/fetch/FetchManager.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/V8ThrowException.h"
@@ skipping 814 matching lines @@
   m_loader->start(request);
 }
 
 // performDataFetch() is almost the same as performHTTPFetch(), except for:
 // - We set AllowCrossOriginRequests to allow requests to data: URLs in
 //   'same-origin' mode.
 // - We reject non-GET method.
 void FetchManager::Loader::performDataFetch() {
   ASSERT(m_request->url().protocolIsData());
 
-  // Spec: https://fetch.spec.whatwg.org/#concept-basic-fetch
-  // If |request|'s method is `GET` .... Otherwise, return a network error.
-  if (m_request->method() != HTTPNames::GET) {
-    performNetworkError(
-        "Only 'GET' method is allowed for data URLs in Fetch API.");
-    return;
-  }
-
   ResourceRequest request(m_request->url());
   request.setRequestContext(m_request->context());
   request.setUseStreamOnResponse(true);
   request.setHTTPMethod(m_request->method());
   request.setFetchRedirectMode(WebURLRequest::FetchRedirectModeError);
   // We intentionally skip 'setExternalRequestStateFromRequestorAddressSpace',
   // as 'data:' can never be external.
 
   ResourceLoaderOptions resourceLoaderOptions;
   resourceLoaderOptions.dataBufferingPolicy = DoNotBufferData;
@@ skipping 70 matching lines @@
   m_loaders.remove(loader);
   loader->dispose();
 }
 
 DEFINE_TRACE(FetchManager) {
   visitor->trace(m_loaders);
   ContextLifecycleObserver::trace(visitor);
 }
 
 }  // namespace blink