Refactor determineRequestContext() to remove a mutableResourceRequest() call

third_party/WebKit/Source/core/html/parser/PreloadRequest.cpp

Index: third_party/WebKit/Source/core/html/parser/PreloadRequest.cpp
diff --git a/third_party/WebKit/Source/core/html/parser/PreloadRequest.cpp b/third_party/WebKit/Source/core/html/parser/PreloadRequest.cpp
index aefdfa3f7c67387d92cc0fd342c0b0722991bdb5..0d585a93bae53c80d4b4461e8435c9b4a082d02c 100644
--- a/third_party/WebKit/Source/core/html/parser/PreloadRequest.cpp
+++ b/third_party/WebKit/Source/core/html/parser/PreloadRequest.cpp
@@ -41,8 +41,8 @@ Resource* PreloadRequest::start(Document* document) {
   ResourceRequest resourceRequest(url);
   resourceRequest.setHTTPReferrer(SecurityPolicy::generateReferrer(
       m_referrerPolicy, url, document->outgoingReferrer()));
-  ResourceFetcher::determineRequestContext(resourceRequest, m_resourceType,
-                                           false);
+  resourceRequest.setRequestContext(
+      ResourceFetcher::determineRequestContext(m_resourceType, false));
 
   FetchRequest request(resourceRequest, initiatorInfo);