Add histograms for a number of hacks in the HTTP header parsing logic.

net/http/http_stream_parser.h

Index: net/http/http_stream_parser.h
diff --git a/net/http/http_stream_parser.h b/net/http/http_stream_parser.h
index f0746fc1c72c23cf88ad39bf2cb65c495dab5357..ea810196e7de7a0e96811e61c4f19393dcb7490d 100644
--- a/net/http/http_stream_parser.h
+++ b/net/http/http_stream_parser.h
@@ -160,11 +160,11 @@ class NET_EXPORT_PRIVATE HttpStreamParser {
   // found, parse them with DoParseResponseHeaders().  Return the offset for
   // the end of the headers, or -1 if the complete headers were not found, or
   // with a net::Error if we encountered an error during parsing.
-  int ParseResponseHeaders();
+  int FindAndParseResponseHeaders();
 
   // Parse the headers into response_.  Returns OK on success or a net::Error on
   // failure.
-  int DoParseResponseHeaders(int end_of_header_offset);
+  int ParseResponseHeaders(int end_of_header_offset);
 
   // Examine the parsed headers to try to determine the response body size.
   void CalculateResponseBodySize();