Use crossystem rather than cros_boot_mode.

utils.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_UTILS_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_UTILS_H__
 
 #include <errno.h>
 
 #include <algorithm>
@@ skipping 11 matching lines @@
 
 namespace utils {
 
 // Returns true if this is an official Chrome OS build, false otherwise.
 bool IsOfficialBuild();
 
 // Returns true if the OOBE process has been completed and EULA accepted, false
 // otherwise.
 bool IsOOBEComplete();
 
-// Returns true if the boot mode is normal, false otherwise (e.g., developer or
-// recovery).
+// Returns true if the boot mode is normal or if it's unable to determine the
+// boot mode. Returns false if the boot mode is developer.
 bool IsNormalBootMode();
 
 // Writes the data passed to path. The file at path will be overwritten if it
 // exists. Returns true on success, false otherwise.
 bool WriteFile(const char* path, const char* data, int data_len);
 
 // Calls write() or pwrite() repeatedly until all count bytes at buf are
 // written to fd or an error occurs. Returns true on success.
 bool WriteAll(int fd, const void* buf, size_t count);
 bool PWriteAll(int fd, const void* buf, size_t count, off_t offset);
@@ skipping 379 matching lines @@
     if (_error) {                                                              \
       errno = _error;                                                          \
       LOG(ERROR) << #_x " failed: " << _error;                                 \
       return false;                                                            \
     }                                                                          \
   } while (0)
 
 
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_UTILS_H__