Http Cache: First pass of byte-range requests support....

net/http/http_response_headers.cc

Index: net/http/http_response_headers.cc
===================================================================
--- net/http/http_response_headers.cc	(revision 18197)
+++ net/http/http_response_headers.cc	(working copy)
@@ -121,6 +121,9 @@
   if ((options & PERSIST_SANS_HOP_BY_HOP) == PERSIST_SANS_HOP_BY_HOP)
     AddHopByHopHeaders(&filter_headers);
 
+  if ((options & PERSIST_SANS_RANGES) == PERSIST_SANS_RANGES)
+    AddHopContentRangeHeaders(&filter_headers);
+
   std::string blob;
   blob.reserve(raw_headers_.size());
 
@@ -645,6 +648,10 @@
     result->insert(std::string(kChallengeResponseHeaders[i]));
 }
 
+void HttpResponseHeaders::AddHopContentRangeHeaders(HeaderSet* result) {
+  result->insert("content-range");
+}
+
 void HttpResponseHeaders::GetMimeTypeAndCharset(std::string* mime_type,
                                                 std::string* charset) const {
   mime_type->clear();