Range request support for parallel download in DownloadRequestCore.

net/http/http_request_headers.cc

Index: net/http/http_request_headers.cc
diff --git a/net/http/http_request_headers.cc b/net/http/http_request_headers.cc
index 70f6d27a95698fcabe3e900fa8a0fe9acd8175d6..18e6def6bb2bbfd2af722b6e53da3aad4d2c6655 100644
--- a/net/http/http_request_headers.cc
+++ b/net/http/http_request_headers.cc
@@ -29,9 +29,11 @@ const char HttpRequestHeaders::kContentLength[] = "Content-Length";
 const char HttpRequestHeaders::kContentType[] = "Content-Type";
 const char HttpRequestHeaders::kCookie[] = "Cookie";
 const char HttpRequestHeaders::kHost[] = "Host";
+const char HttpRequestHeaders::kIfMatch[] = "If-Match";
 const char HttpRequestHeaders::kIfModifiedSince[] = "If-Modified-Since";
 const char HttpRequestHeaders::kIfNoneMatch[] = "If-None-Match";
 const char HttpRequestHeaders::kIfRange[] = "If-Range";
+const char HttpRequestHeaders::kIfUnmodifiedSince[] = "If-Unmodified-Since";
 const char HttpRequestHeaders::kOrigin[] = "Origin";
 const char HttpRequestHeaders::kPragma[] = "Pragma";
 const char HttpRequestHeaders::kProxyAuthorization[] = "Proxy-Authorization";