Upstream changes to HttpUrlRequest for querying response headers and closing ReadableByteChannel.

components/cronet/android/url_request_peer.h

Index: components/cronet/android/url_request_peer.h
diff --git a/components/cronet/android/url_request_peer.h b/components/cronet/android/url_request_peer.h
index ddd5e235b802ea84153d3f3404b19bc31dc64d78..d54bc9121a1a87d6e8edd3604175de7c7c58a962 100644
--- a/components/cronet/android/url_request_peer.h
+++ b/components/cronet/android/url_request_peer.h
@@ -84,6 +84,9 @@ class URLRequestPeer : public net::URLRequest::Delegate {
   // Returns the value of the content-type response header.
   std::string content_type() const { return content_type_; }
 
+  // Returns the value of the specified response header.
+  std::string GetHeader(const std::string& name) const;
+
   // Returns the overall number of bytes read.
   size_t bytes_read() const { return bytes_read_; }