[Cleanup] Remove some expired omnibox field trials.

components/omnibox/browser/base_search_provider.cc

 // 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.
 
 #include "components/omnibox/browser/base_search_provider.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/i18n/case_conversion.h"
@@ skipping 133 matching lines @@
   // Immediately update the list of matches to show the match was deleted,
   // regardless of whether the server request actually succeeds.
   DeleteMatchFromMatches(match);
 }
 
 void BaseSearchProvider::AddProviderInfo(ProvidersInfo* provider_info) const {
   provider_info->push_back(metrics::OmniboxEventProto_ProviderInfo());
   metrics::OmniboxEventProto_ProviderInfo& new_entry = provider_info->back();
   new_entry.set_provider(AsOmniboxEventProviderType());
   new_entry.set_provider_done(done_);
-  std::vector<uint32_t> field_trial_hashes;
-  OmniboxFieldTrial::GetActiveSuggestFieldTrialHashes(&field_trial_hashes);

[Mark P, 2016/01/14 05:31:02]

This code cannot be removed because it's part of the omnibox bundled field
trial.  See my comment elsewhere.

[Ilya Sherman, 2016/01/14 05:40:41]

Done.

-  for (size_t i = 0; i < field_trial_hashes.size(); ++i) {
-    if (field_trial_triggered_)
-      new_entry.mutable_field_trial_triggered()->Add(field_trial_hashes[i]);
-    if (field_trial_triggered_in_session_) {
-      new_entry.mutable_field_trial_triggered_in_session()->Add(
-          field_trial_hashes[i]);
-    }
-  }
 }
 
 // static
 const char BaseSearchProvider::kRelevanceFromServerKey[] =
     "relevance_from_server";
 const char BaseSearchProvider::kShouldPrefetchKey[] = "should_prefetch";
 const char BaseSearchProvider::kSuggestMetadataKey[] = "suggest_metadata";
 const char BaseSearchProvider::kDeletionUrlKey[] = "deletion_url";
 const char BaseSearchProvider::kTrue[] = "true";
 const char BaseSearchProvider::kFalse[] = "false";
@@ skipping 306 matching lines @@
 }
 
 void BaseSearchProvider::OnDeletionComplete(
     bool success, SuggestionDeletionHandler* handler) {
   RecordDeletionResult(success);
   SuggestionDeletionHandlers::iterator it = std::find(
       deletion_handlers_.begin(), deletion_handlers_.end(), handler);
   DCHECK(it != deletion_handlers_.end());
   deletion_handlers_.erase(it);
 }