[Android] Switch to DeviceUtils versions of file functions.

tools/telemetry/telemetry/core/platform/profiler/android_profiling_helper_unittest.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 os
 import pickle
 import re
 import shutil
 import tempfile
 
 from telemetry import benchmark
 from telemetry.core import util
 from telemetry.core.platform.profiler import android_profiling_helper
 from telemetry.unittest import simple_mock
 from telemetry.unittest import tab_test_case
 
 
 def _GetLibrariesMappedIntoProcesses(device, pids):
   libs = set()
   for pid in pids:
     maps_file = '/proc/%d/maps' % pid
-    maps = device.old_interface.GetProtectedFileContents(maps_file)
+    maps = device.ReadFile(maps_file, as_root=True)
     for map_line in maps:
       lib = re.match(r'.*\s(/.*[.]so)$', map_line)
       if lib:
         libs.add(lib.group(1))
   return libs
 
 
 class TestAndroidProfilingHelper(tab_test_case.TabTestCase):
   def setUp(self):
     super(TestAndroidProfilingHelper, self).setUp()
@@ skipping 86 matching lines @@
       # Check that all requested libraries are present.
       for lib in libs:
         assert os.path.exists(os.path.join(symfs_dir, lib[1:])), \
             '%s not found in symfs' % lib
     finally:
       shutil.rmtree(symfs_dir)
 
   @benchmark.Enabled('android')
   def testGetToolchainBinaryPath(self):
     with tempfile.NamedTemporaryFile() as libc:
-      self._device.old_interface.PullFileFromDevice('/system/lib/libc.so',
-                                                    libc.name)
+      self._device.PullFile('/system/lib/libc.so', libc.name)
       path = android_profiling_helper.GetToolchainBinaryPath(libc.name,
                                                              'objdump')
       assert os.path.exists(path)