Delay generation of User-Agent header to URLRequestHttpJob and accept custom User-Agent from XHR/Fe…

third_party/WebKit/Source/platform/network/ResourceRequest.h

Index: third_party/WebKit/Source/platform/network/ResourceRequest.h
diff --git a/third_party/WebKit/Source/platform/network/ResourceRequest.h b/third_party/WebKit/Source/platform/network/ResourceRequest.h
index 568a00063ab73c2f1044b6d50f5d94a6cf554ee0..03c844796f0d5074aac638fa70df19ee049838cb 100644
--- a/third_party/WebKit/Source/platform/network/ResourceRequest.h
+++ b/third_party/WebKit/Source/platform/network/ResourceRequest.h
@@ -130,10 +130,11 @@ public:
     void clearHTTPOrigin();
     void addHTTPOriginIfNeeded(PassRefPtr<SecurityOrigin>);
 
-    const AtomicString& httpUserAgent() const { return httpHeaderField(HTTPNames::User_Agent); }
-    void setHTTPUserAgent(const AtomicString& httpUserAgent) { setHTTPHeaderField(HTTPNames::User_Agent, httpUserAgent); }
     void clearHTTPUserAgent();
 
+    const AtomicString& defaultHTTPUserAgent() const { return m_defaultHTTPUserAgent; }
+    void setDefaultHTTPUserAgent(const AtomicString& defaultHTTPUserAgent) { m_defaultHTTPUserAgent = defaultHTTPUserAgent; }
+
     void setHTTPAccept(const AtomicString& httpAccept) { setHTTPHeaderField(HTTPNames::Accept, httpAccept); }
 
     EncodedFormData* httpBody() const;
@@ -249,6 +250,7 @@ private:
     RefPtr<SecurityOrigin> m_requestorOrigin;
     AtomicString m_httpMethod;
     HTTPHeaderMap m_httpHeaderFields;
+    AtomicString m_defaultHTTPUserAgent;
     RefPtr<EncodedFormData> m_httpBody;
     RefPtr<EncodedFormData> m_attachedCredential;
     bool m_allowStoredCredentials : 1;
@@ -298,6 +300,7 @@ public:
 
     String m_httpMethod;
     std::unique_ptr<CrossThreadHTTPHeaderMapData> m_httpHeaders;
+    String m_defaultHTTPUserAgent;
     RefPtr<EncodedFormData> m_httpBody;
     RefPtr<EncodedFormData> m_attachedCredential;
     bool m_allowStoredCredentials;