[Android] Switch to DeviceUtils versions of file functions.

tools/telemetry/telemetry/core/platform/profiler/android_profiling_helper.py

 # Copyright 2014 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.
 
 import glob
 import hashlib
 import logging
 import os
 import platform
 import re
@@ skipping 179 matching lines @@
       # speed things up, only pull files that don't match copies we already
       # have in the symfs.
       if not device_dir in mismatching_files:
         changed_files = device.old_interface.GetFilesChanged(output_dir,
                                                              device_dir)
         mismatching_files[device_dir] = [
             device_path for _, device_path in changed_files]
 
       if not os.path.exists(output_lib) or lib in mismatching_files[device_dir]:
         logging.info('Pulling %s to %s' % (lib, output_lib))
-        device.old_interface.PullFileFromDevice(lib, output_lib)
+        device.PullFile(lib, output_lib)
 
   # Also pull a copy of the kernel symbols.
   output_kallsyms = os.path.join(symfs_dir, 'kallsyms')
   if not os.path.exists(output_kallsyms):
-    device.old_interface.PullFileFromDevice('/proc/kallsyms', output_kallsyms)
+    device.PullFile('/proc/kallsyms', output_kallsyms)
   return output_kallsyms
 
 
 def PrepareDeviceForPerf(device):
   """Set up a device for running perf.
 
   Args:
     device: DeviceUtils instance identifying the target device.
 
   Returns:
     The path to the installed perf binary on the device.
   """
   android_prebuilt_profiler_helper.InstallOnDevice(device, 'perf')
   # Make sure kernel pointers are not hidden.
-  device.old_interface.SetProtectedFileContents(
-      '/proc/sys/kernel/kptr_restrict', '0')
+  device.WriteFile('/proc/sys/kernel/kptr_restrict', '0', as_root=True)
   return android_prebuilt_profiler_helper.GetDevicePath('perf')
 
 
 def GetToolchainBinaryPath(library_file, binary_name):
   """Return the path to an Android toolchain binary on the host.
 
   Args:
     library_file: ELF library which is used to identify the used ABI,
         architecture and toolchain.
     binary_name: Binary to search for, e.g., 'objdump'
@@ skipping 19 matching lines @@
     return None
   toolchain_version = toolchain_version.group(1)
 
   path = os.path.join(util.GetChromiumSrcDir(), 'third_party', 'android_tools',
                       'ndk', 'toolchains',
                       '%s-%s' % (toolchain_config, toolchain_version),
                       'prebuilt', '%s-%s' % (host_os, host_machine), 'bin',
                       '%s-%s' % (toolchain_config, binary_name))
   path = os.path.abspath(path)
   return path if os.path.exists(path) else None