[Part 3 of 6] Switch ColumnSpecifier to enum class. This makes straddling namespaces easier.

chrome/browser/task_manager/task_manager_browsertest_util.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_BROWSERTEST_UTIL_H_
 #define CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_BROWSERTEST_UTIL_H_
 
 #include <stddef.h>
 
 #include <memory>
 
 #include "base/strings/string16.h"
 
 namespace content {
 class WebContents;
 }
 
 // TODO(nick): Move everything here (except for LegacyTaskManagerTesterImpl)
 // into the task_management namespace.
 namespace task_manager {
 namespace browsertest_util {
 
 // Specifies some integer-valued column of numeric data reported by the task
 // manager model. Please add more here as needed by tests.
-enum ColumnSpecifier {
+enum class ColumnSpecifier {
   V8_MEMORY,
   V8_MEMORY_USED,
   SQLITE_MEMORY_USED,
 
   COLUMN_NONE,  // Default value.
 };
 
 // An adapter that abstracts away the difference of old vs. new task manager.
 class TaskManagerTester {
  public:
@@ skipping 66 matching lines @@
 base::string16 MatchSubframe(const char* title);    // "Subframe: " + title
 base::string16 MatchAnySubframe();                  // "Subframe: *"
 // "Utility: " + title
 base::string16 MatchUtility(const base::string16& title);
 base::string16 MatchAnyUtility();                   // "Utility: *"
 
 }  // namespace browsertest_util
 }  // namespace task_manager
 
 #endif  // CHROME_BROWSER_TASK_MANAGER_TASK_MANAGER_BROWSERTEST_UTIL_H_