html_viewer: Set expected content length to -1 in ToWebURLResponse().

mojo/services/html_viewer/weburlloader_impl.cc

Index: mojo/services/html_viewer/weburlloader_impl.cc
diff --git a/mojo/services/html_viewer/weburlloader_impl.cc b/mojo/services/html_viewer/weburlloader_impl.cc
index ffda366c8d85aca8eb0383f0378a891cd8e6b4a1..d7c768819ddf14375121815a46519dfb79e24179 100644
--- a/mojo/services/html_viewer/weburlloader_impl.cc
+++ b/mojo/services/html_viewer/weburlloader_impl.cc
@@ -45,6 +45,7 @@ blink::WebURLResponse ToWebURLResponse(const URLResponsePtr& url_response) {
   result.setTextEncodingName(blink::WebString::fromUTF8(url_response->charset));
   result.setHTTPVersion(StatusLineToHTTPVersion(url_response->status_line));
   result.setHTTPStatusCode(url_response->status_code);
+  result.setExpectedContentLength(-1);  // Not available.
 
   // TODO(darin): Initialize timing properly.
   blink::WebURLLoadTiming timing;