Cleaned up the API of HttpUtil::ParseContentRangeHeader().

net/http/http_util.h

Index: net/http/http_util.h
diff --git a/net/http/http_util.h b/net/http/http_util.h
index fe68423f6085473cd8af01f4bcbae363c063d308..d35a2fcc4b640886030a55caff1d6941f339259e 100644
--- a/net/http/http_util.h
+++ b/net/http/http_util.h
@@ -60,16 +60,13 @@ class NET_EXPORT HttpUtil {
   static bool ParseRangeHeader(const std::string& range_specifier,
                                std::vector<HttpByteRange>* ranges);
 
-  // Extracts the values in a Content-Range header and returns true if they are
-  // valid for a 206 response; otherwise returns false.
+  // Extracts the values in a Content-Range header and returns true if all three
+  // values are present and valid for a 206 response; otherwise returns false.
   // The following values will be outputted:
   // |*first_byte_position| = inclusive position of the first byte of the range
   // |*last_byte_position| = inclusive position of the last byte of the range
   // |*instance_length| = size in bytes of the object requested
-  // If any of the above values is unknown, its value will be -1.
-  // TODO(sclittle): Change this method to only support Content-Range headers
-  // from 206 responses, since right now it only has incomplete support for
-  // Content-Range headers from 416 responses. See crbug.com/670913.
+  // If this method returns false, then all of the outputs will be -1.
   static bool ParseContentRangeHeader(base::StringPiece content_range_spec,
                                       int64_t* first_byte_position,
                                       int64_t* last_byte_position,