NTPSnippets: Set MaxRetriesOn5xx only for interactive requests.

components/ntp_snippets/remote/ntp_snippets_fetcher.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_FETCHER_H_
 #define COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_FETCHER_H_
 
 #include <memory>
 #include <queue>
 #include <set>
@@ skipping 205 matching lines @@
     RequestBuilder& SetPersonalization(Personalization personalization);
     // The tick_clock borrowed from the fetcher will be injected into the
     // request. It will be used at build time and after the fetch returned.
     // It has to be alive until the request is destroyed.
     RequestBuilder& SetTickClock(base::TickClock* tick_clock);
     RequestBuilder& SetUrl(const GURL& url);
     RequestBuilder& SetUrlRequestContextGetter(
         const scoped_refptr<net::URLRequestContextGetter>& context_getter);
     RequestBuilder& SetUserClassifier(const UserClassifier& user_classifier);
 
+    // These preview methods allow to inspect the Request without exposing it
+    // publicly.
+    // TODO(fhorschig): Remove these when moving the RequestBuilder to
+    // snippets::internal and trigger the request to intercept the request.
     std::string PreviewRequestBodyForTesting() { return BuildBody(); }
     std::string PreviewRequestHeadersForTesting() { return BuildHeaders(); }
     RequestBuilder& SetUserClassForTesting(const std::string& user_class) {
       user_class_ = user_class;
       return *this;
     }
 
    protected:
     // TODO(fhorschig): As soon as crbug.com/crbug.com/645447 is resolved,
     // make these an implementation detail in the body and remove the mock.
@@ skipping 121 matching lines @@
   std::string last_status_;
   std::string last_fetch_json_;
 
   base::WeakPtrFactory<NTPSnippetsFetcher> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPSnippetsFetcher);
 };
 }  // namespace ntp_snippets
 
 #endif  // COMPONENTS_NTP_SNIPPETS_REMOTE_NTP_SNIPPETS_FETCHER_H_