Implement request's redirect mode and RequestRedirect for Fetch

Source/platform/network/ResourceRequestTest.cpp

Index: Source/platform/network/ResourceRequestTest.cpp
diff --git a/Source/platform/network/ResourceRequestTest.cpp b/Source/platform/network/ResourceRequestTest.cpp
index 7256138dc01bb8701fcbe67e189d24d3420fc346..daf104a008b59b69103c7ad889531188558bb2ed 100644
--- a/Source/platform/network/ResourceRequestTest.cpp
+++ b/Source/platform/network/ResourceRequestTest.cpp
@@ -39,6 +39,7 @@ TEST(ResourceRequestTest, CrossThreadResourceRequestData)
     original.setRequestorProcessID(40);
     original.setAppCacheHostID(50);
     original.setRequestContext(WebURLRequest::RequestContextAudio);
+    original.setFetchRedirectMode(WebURLRequest::FetchRedirectModeFollow);
     original.setFrameType(WebURLRequest::FrameTypeNested);
     original.setHTTPReferrer(Referrer("http://www.example.com/referrer.htm", ReferrerPolicyDefault));
 
@@ -62,6 +63,7 @@ TEST(ResourceRequestTest, CrossThreadResourceRequestData)
     EXPECT_EQ(40, original.requestorProcessID());
     EXPECT_EQ(50, original.appCacheHostID());
     EXPECT_EQ(WebURLRequest::RequestContextAudio, original.requestContext());
+    EXPECT_EQ(WebURLRequest::FetchRedirectModeFollow, original.fetchRedirectMode());
     EXPECT_EQ(WebURLRequest::FrameTypeNested, original.frameType());
     EXPECT_STREQ("http://www.example.com/referrer.htm", original.httpReferrer().utf8().data());
     EXPECT_EQ(ReferrerPolicyDefault, original.referrerPolicy());