Http cache: Make sure that issuing a byte range request

net/http/partial_data.cc

Index: net/http/partial_data.cc
===================================================================
--- net/http/partial_data.cc	(revision 148620)
+++ net/http/partial_data.cc	(working copy)
@@ -242,9 +242,6 @@
                                           disk_cache::Entry* entry,
                                           bool truncated) {
   resource_size_ = 0;
-  if (!headers->HasStrongValidators())
-    return false;
-
   if (truncated) {
     DCHECK_EQ(headers->response_code(), 200);
     // We don't have the real length and the user may be trying to create a
@@ -252,6 +249,9 @@
     if (byte_range_.IsValid())
       return false;
 
+    if (!headers->HasStrongValidators())
+      return false;
+
     // Now we avoid resume if there is no content length, but that was not
     // always the case so double check here.
     int64 total_length = headers->GetContentLength();
@@ -270,7 +270,7 @@
     return true;
   }
 
-  if (headers->response_code() == 200) {
+  if (headers->response_code() != 206) {
     DCHECK(byte_range_.IsValid());
     sparse_entry_ = false;
     resource_size_ = entry->GetDataSize(kDataStream);