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

chrome/android/javatests/src/org/chromium/chrome/browser/offlinepages/OfflinePageSavePageLaterEvaluationTest.java

 // 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.
 
 package org.chromium.chrome.browser.offlinepages;
 
 import android.app.NotificationManager;
 import android.content.Context;
 import android.os.Environment;
 import android.text.TextUtils;
@@ skipping 379 matching lines @@
             case BackgroundSavePageResult.FOREGROUND_CANCELED:
                 return "FOREGROUND_CANCELED";
             case BackgroundSavePageResult.SAVE_FAILED:
                 return "SAVE_FAILED";
             case BackgroundSavePageResult.EXPIRED:
                 return "EXPIRED";
             case BackgroundSavePageResult.RETRY_COUNT_EXCEEDED:
                 return "RETRY_COUNT_EXCEEDED";
             case BackgroundSavePageResult.START_COUNT_EXCEEDED:
                 return "START_COUNT_EXCEEDED";
-            case BackgroundSavePageResult.REMOVED:
-                return "REMOVED";
+            case BackgroundSavePageResult.USER_CANCELED:
+                return "USER_CANCELED";
             case -1:
                 return "NOT_COMPLETED";
             default:
                 return "UNDEFINED_STATUS";
         }
     }
 
     /**
      * Get saved offline pages and align them with the metadata we got from testing.
      */
@@ skipping 131 matching lines @@
     @Test
     @Manual
     @TimeoutScale(4)
     @CommandLineFlags.Add({"enable-features=BackgroundLoaderOfflinePagesSvelteConcurrentLoading"})
     @CommandLineFlags.Remove({
             "disable-features=BackgroundLoaderOfflinePagesSvelteConcurrentLoading"})
     public void testBackgroundLoaderFailureRate() throws IOException, InterruptedException {
         testFailureRate();
     }
 }