Return const by ref instead of const by Value in FetchRequestData::method

Source/modules/fetch/FetchRequestData.h

 // 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.
 
 #ifndef FetchRequestData_h
 #define FetchRequestData_h
 
 #include "platform/heap/Handle.h"
 #include "platform/weborigin/KURL.h"
 #include "platform/weborigin/Referrer.h"
@@ skipping 46 matching lines @@
     };
 
     static FetchRequestData* create();
     static FetchRequestData* create(ExecutionContext*, const WebServiceWorkerRequest&);
     // Call Request::refreshBody() after calling clone() or pass().
     FetchRequestData* clone(ExecutionContext*);
     FetchRequestData* pass(ExecutionContext*);
     ~FetchRequestData();
 
     void setMethod(AtomicString method) { m_method = method; }
-    const AtomicString method() const { return m_method; }
+    const AtomicString& method() const { return m_method; }
     void setURL(const KURL& url) { m_url = url; }
     const KURL& url() const { return m_url; }
     bool unsafeRequestFlag() const { return m_unsafeRequestFlag; }
     void setUnsafeRequestFlag(bool flag) { m_unsafeRequestFlag = flag; }
     WebURLRequest::RequestContext context() const { return m_context; }
     void setContext(WebURLRequest::RequestContext context) { m_context = context; }
     PassRefPtr<SecurityOrigin> origin() { return m_origin; }
     void setOrigin(PassRefPtr<SecurityOrigin> origin) { m_origin = origin; }
     bool sameOriginDataURLFlag() { return m_sameOriginDataURLFlag; }
     void setSameOriginDataURLFlag(bool flag) { m_sameOriginDataURLFlag = flag; }
@@ skipping 36 matching lines @@
     // FIXME: Support m_manualRedirectFlag;
     // FIXME: Support m_redirectCount;
     Tainting m_responseTainting;
     Member<BodyStreamBuffer> m_buffer;
     String m_mimeType;
 };
 
 } // namespace blink
 
 #endif // FetchRequestData_h