Duplicate unique id of network traffic annotation corrected.

Unique id of two network traffic annotations were the same. One was changed.

Bug: 656607
Change-Id: Ifa2f3a8e2aab4e3ec9e07275fc4b66371719c25b
Reviewed-on: https://chromium-review.googlesource.com/570034
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Scott Byer <scottbyer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487396}

chrome/browser/printing/cloud_print/privet_http_impl.cc

@@ -729,7 +729,7 @@ std::unique_ptr<PrivetURLFetcher> PrivetHTTPClientImpl::CreateURLFetcher(
   replacements.SetPortStr(port);
 
   net::NetworkTrafficAnnotationTag traffic_annotation =
-      net::DefineNetworkTrafficAnnotation("cloud_print", R"(
+      net::DefineNetworkTrafficAnnotation("privet_http_impl", R"(
         semantics {
           sender: "Cloud Print"
           description: