[Offline pages] Rename REMOVED to USER_CANCELED and add better foot note descriptions for histogram…

components/offline_pages/core/background/request_coordinator_event_logger.cc

 // 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.
 
 #include "components/offline_pages/core/background/request_coordinator_event_logger.h"
 
 namespace offline_pages {
 
 namespace {
 
@@ skipping 50 matching lines @@
     case RequestNotifier::BackgroundSavePageResult::FOREGROUND_CANCELED:
       return "FOREGROUND_CANCELED";
     case RequestNotifier::BackgroundSavePageResult::SAVE_FAILED:
       return "SAVE_FAILED";
     case RequestNotifier::BackgroundSavePageResult::EXPIRED:
       return "EXPIRED";
     case RequestNotifier::BackgroundSavePageResult::RETRY_COUNT_EXCEEDED:
       return "RETRY_COUNT_EXCEEDED";
     case RequestNotifier::BackgroundSavePageResult::START_COUNT_EXCEEDED:
       return "START_COUNT_EXCEEDED";
-    case RequestNotifier::BackgroundSavePageResult::REMOVED:
+    case RequestNotifier::BackgroundSavePageResult::USER_CANCELED:
       return "REMOVED";
     default:
       NOTREACHED();
       return std::to_string(static_cast<int>(result));
   }
 }
 
 static std::string UpdateRequestResultToString(UpdateRequestResult result) {
   switch (result) {
     case UpdateRequestResult::SUCCESS:
@@ skipping 31 matching lines @@
 }
 
 void RequestCoordinatorEventLogger::RecordUpdateRequestFailed(
     const std::string& name_space,
     UpdateRequestResult result) {
   RecordActivity("Updating queued request for " + name_space + " failed - " +
                  UpdateRequestResultToString(result));
 }
 
 }  // namespace offline_pages