Create task_manager namespace and wrap classes related to TaskManager with it.

chrome/browser/task_manager/os_resource_win.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 "chrome/browser/task_manager/task_manager_os_resources_win.h"
+#include "chrome/browser/task_manager/os_resource_win.h"
+
+namespace task_manager {
 
 void GetWinGDIHandles(base::ProcessHandle process,
                       size_t* current,
                       size_t* peak) {
   *current = 0;
   *peak = 0;
   // Get a handle to |process| that has PROCESS_QUERY_INFORMATION rights.
   HANDLE current_process = GetCurrentProcess();
   HANDLE process_with_query_rights;
   if (DuplicateHandle(current_process, process, current_process,
@@ skipping 14 matching lines @@
   HANDLE current_process = GetCurrentProcess();
   HANDLE process_with_query_rights;
   if (DuplicateHandle(current_process, process, current_process,
                       &process_with_query_rights, PROCESS_QUERY_INFORMATION,
                       false, 0)) {
     *current = GetGuiResources(process_with_query_rights, GR_USEROBJECTS);
     *peak = GetGuiResources(process_with_query_rights, GR_USEROBJECTS_PEAK);
     CloseHandle(process_with_query_rights);
   }
 }
+
+}  // namespace task_manager