[Sync] Deprecate old histograms

components/sync_sessions/favicon_cache.cc

 // Copyright 2013 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/sync_sessions/favicon_cache.h"
 
 #include <utility>
 
 #include "base/location.h"
 #include "base/macros.h"
@@ skipping 262 matching lines @@
       merge_result.set_num_items_added(merge_result.num_items_added() + 1);
     }
   }
 
   // Rather than trigger a bunch of deletions when we set up sync, we drop
   // local favicons. Those pages that are currently open are likely to result in
   // loading new favicons/refreshing old favicons anyways, at which point
   // they'll be re-added and the appropriate synced favicons will be evicted.
   // TODO(zea): implement a smarter ordering of the which favicons to drop.
   int available_favicons = max_sync_favicon_limit_ - initial_sync_data.size();
-  UMA_HISTOGRAM_BOOLEAN("Sync.FaviconsAvailableAtMerge",
-                        available_favicons > 0);
   for (std::set<GURL>::const_iterator iter = unsynced_favicon_urls.begin();
        iter != unsynced_favicon_urls.end(); ++iter) {
     if (available_favicons > 0) {
       local_changes.push_back(
           syncer::SyncChange(FROM_HERE,
                              syncer::SyncChange::ACTION_ADD,
                              CreateSyncDataFromLocalFavicon(type, *iter)));
       available_favicons--;
     } else {
       FaviconMap::iterator favicon_iter = synced_favicons_.find(*iter);
       DVLOG(1) << "Dropping local favicon "
                << favicon_iter->second->favicon_url.spec();
       DropPartialFavicon(favicon_iter, type);
       merge_result.set_num_items_deleted(merge_result.num_items_deleted() + 1);
     }
   }
-  UMA_HISTOGRAM_COUNTS_10000("Sync.FaviconCount", synced_favicons_.size());
   merge_result.set_num_items_after_association(synced_favicons_.size());
 
   if (type == syncer::FAVICON_IMAGES) {
     favicon_images_sync_processor_->ProcessSyncChanges(FROM_HERE,
                                                        local_changes);
   } else {
     favicon_tracking_sync_processor_->ProcessSyncChanges(FROM_HERE,
                                                          local_changes);
   }
   return merge_result;
@@ skipping 302 matching lines @@
 
   for (std::map<GURL, LocalFaviconUpdateInfo>::const_iterator
            iter = favicon_updates.begin(); iter != favicon_updates.end();
        ++iter) {
     SyncedFaviconInfo* favicon_info = iter->second.favicon_info;
     const GURL& favicon_url = favicon_info->favicon_url;
 
     // TODO(zea): support multiple favicon urls per page.
     page_favicon_map_[page_url] = favicon_url;
 
-    if (!favicon_info->last_visit_time.is_null()) {
-      UMA_HISTOGRAM_COUNTS_10000(
-          "Sync.FaviconVisitPeriod",
-          (now - favicon_info->last_visit_time).InHours());
-    }
     favicon_info->received_local_update = true;
     UpdateFaviconVisitTime(favicon_url, now);
 
     syncer::SyncChange::SyncChangeType image_change =
         syncer::SyncChange::ACTION_INVALID;
     if (iter->second.new_image)
       image_change = syncer::SyncChange::ACTION_ADD;
     else if (iter->second.image_needs_rewrite)
       image_change = syncer::SyncChange::ACTION_UPDATE;
     syncer::SyncChange::SyncChangeType tracking_change =
@@ skipping 410 matching lines @@
     favicon_images_sync_processor_->ProcessSyncChanges(FROM_HERE,
                                                        image_deletions);
   }
   if (favicon_tracking_sync_processor_.get()) {
     favicon_tracking_sync_processor_->ProcessSyncChanges(FROM_HERE,
                                                          tracking_deletions);
   }
 }
 
 }  // namespace browser_sync