Implement request's redirect mode and RequestRedirect for Fetch

Source/platform/network/ResourceRequest.h

Index: Source/platform/network/ResourceRequest.h
diff --git a/Source/platform/network/ResourceRequest.h b/Source/platform/network/ResourceRequest.h
index 8023118792cdc72563dc2d413abc6b7e80854767..026cbb0a271e79137335b8b993e1e1e8f1b64580 100644
--- a/Source/platform/network/ResourceRequest.h
+++ b/Source/platform/network/ResourceRequest.h
@@ -211,6 +211,9 @@ public:
     WebURLRequest::FetchCredentialsMode fetchCredentialsMode() const { return m_fetchCredentialsMode; }
     void setFetchCredentialsMode(WebURLRequest::FetchCredentialsMode mode) { m_fetchCredentialsMode = mode; }
 
+    WebURLRequest::FetchRedirectMode fetchRedirectMode() const { return m_fetchRedirectMode; }
+    void setFetchRedirectMode(WebURLRequest::FetchRedirectMode mode) { m_fetchRedirectMode = mode; }
+
     bool cacheControlContainsNoCache() const;
     bool cacheControlContainsNoStore() const;
     bool hasCacheValidatorFields() const;
@@ -266,6 +269,7 @@ private:
     WebURLRequest::FrameType m_frameType;
     WebURLRequest::FetchRequestMode m_fetchRequestMode;
     WebURLRequest::FetchCredentialsMode m_fetchCredentialsMode;
+    WebURLRequest::FetchRedirectMode m_fetchRedirectMode;
     ReferrerPolicy m_referrerPolicy;
     bool m_didSetHTTPReferrer;
     bool m_checkForBrowserSideNavigation;
@@ -315,6 +319,7 @@ public:
     WebURLRequest::FrameType m_frameType;
     WebURLRequest::FetchRequestMode m_fetchRequestMode;
     WebURLRequest::FetchCredentialsMode m_fetchCredentialsMode;
+    WebURLRequest::FetchRedirectMode m_fetchRedirectMode;
     ReferrerPolicy m_referrerPolicy;
     bool m_didSetHTTPReferrer;
     bool m_checkForBrowserSideNavigation;