wm: Update namespace and header define guards.

src/platform/window_manager/metrics_reporter.cc

 // Copyright (c) 2009 The Chromium OS 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 "window_manager/metrics_reporter.h"
 
 #include <stdio.h>
 
 #include "window_manager/layout_manager.h"
 #include "window_manager/system_metrics.pb.h"
 #include "window_manager/window.h"
 
-namespace chromeos {
+namespace window_manager {
 
 // This is the path to a file that's created by boot scripts, which contains
 // the boot time drawn from bootchart.
 // TODO: communicate this information over something like DBus.
 const char kBootTimeFilename[] = "/tmp/boot-time";
 
 class ScopedFilePointer {
  public:
   explicit ScopedFilePointer(FILE* const fp) : fp_(fp) {}
   ~ScopedFilePointer() {
@@ skipping 42 matching lines @@
     return false;
   }
   int boot_time;
   if (0 == sscanf(line, "%d", &boot_time)) {  // should ignore trailing \n
     return false;
   }
   metrics->set_boot_time_ms(boot_time);
   return true;
 }
 
-}  // namespace chromeos
+}  // namespace window_manager