Update comments in Request constructor to explain referrer handling more clearly

third_party/WebKit/Source/modules/fetch/RequestInit.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 "modules/fetch/RequestInit.h"
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/V8ArrayBuffer.h"
 #include "bindings/core/v8/V8ArrayBufferView.h"
@@ skipping 36 matching lines @@
     AtomicString referrerString;
     bool isReferrerStringSet = DictionaryHelper::get(options, "referrer", referrerString);
     areAnyMembersSet |= isReferrerStringSet;
     areAnyMembersSet |= DictionaryHelper::get(options, "integrity", integrity);
 
     v8::Local<v8::Value> v8Body;
     bool isBodySet = DictionaryHelper::get(options, "body", v8Body);
     areAnyMembersSet |= isBodySet;
 
     if (areAnyMembersSet) {
-        // If any of init's members are present, unset request's
-        // omit-Origin-header flag, set request's referrer to "client",
-        // and request's referrer policy to the empty string.
-        //
+        // A part of the Request constructor algorithm is performed here. See
+        // the comments in the Request constructor code for the detail.
+
         // We need to use "about:client" instead of |clientReferrerString|,
         // because "about:client" => |clientReferrerString| conversion is done
         // in Request::createRequestWithRequestOrString.
         referrer = Referrer("about:client", ReferrerPolicyDefault);
         if (isReferrerStringSet)
             referrer.referrer = referrerString;
     }
 
     if (!isBodySet || v8Body->IsUndefined() || v8Body->IsNull())
         return;
@@ skipping 28 matching lines @@
         else
             contentType = AtomicString("multipart/form-data; boundary=", AtomicString::ConstructFromLiteral) + encodedData->boundary().data();
         body = FetchFormDataConsumerHandle::create(context, encodedData.release());
     } else if (v8Body->IsString()) {
         contentType = "text/plain;charset=UTF-8";
         body = FetchFormDataConsumerHandle::create(toUSVString(isolate, v8Body, exceptionState));
     }
 }
 
 }