NewTabPage: Remove impression/click ping plumbing for local NTP

components/suggestions/proto/suggestions.proto

 // Copyright 2014 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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package suggestions;
 
@@ skipping 34 matching lines @@
   optional string favicon_url = 3;
 
   // The URL of the thumbnail associated with this page.
   optional string thumbnail = 4;
 
   // The provider(s) responsible for this suggestion.
   repeated ProviderId providers = 5;
 
   // The timestamp (usec) at which this suggestion ceases to be valid.
   optional int64 expiry_ts = 7;
-
-  // URL that should be pinged back when the suggestion is shown/clicked.
-  optional string impression_url = 13;
-  optional string click_url = 14;

[mastiz, 2016/11/28 13:46:22]

Can you please either:
a) Mark field tags 13 and 14 as reserved.
b) Add a comment higher up saying: "Next ID: 15".

[Marc Treib, 2016/11/28 13:56:47]

There already is a comment above ("Next tag: 15")

 }
 
 // A list of URLs that should be filtered from the SuggestionsProfile.
 //
 // Next tag: 2
 message SuggestionsBlacklist {
   // URLs that make up the blacklist.
   repeated string urls = 1;
 }
 
 // ImageData contains the data to represent a website image (e.g. thumbnail).
 //
 // Next tag: 3
 message ImageData {
   // The URL of the website represented by this image.
   optional string url = 1;
 
   // Bitmap bytes, encoded as JPEG.
   optional bytes data = 2;
 }