[Android] Switch to DeviceUtils versions of file functions.

tools/memory_inspector/memory_inspector/backends/android/android_backend.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.
 
 """Android-specific implementation of the core backend interfaces.
 
 See core/backends.py for more docs.
 """
 
 import datetime
@@ skipping 309 matching lines @@
 
   def DumpNativeHeap(self):
     """Grabs and parses malloc traces through am dumpheap -n."""
     # TODO(primiano): grab also mmap bt (depends on pending framework change).
     dump_file_path = _DUMPHEAP_OUT_FILE_PATH % self.pid
     cmd = 'am dumpheap -n %d %s' % (self.pid, dump_file_path)
     self.device.underlying_device.RunShellCommand(cmd)
     # TODO(primiano): Some pre-KK versions of Android might need a sleep here
     # as, IIRC, 'am dumpheap' did not wait for the dump to be completed before
     # returning. Double check this and either add a sleep or remove this TODO.
-    dump_out = self.device.underlying_device.old_interface.GetFileContents(
-        dump_file_path)
+    dump_out = self.device.underlying_device.ReadFile(dump_file_path)
     self.device.underlying_device.RunShellCommand('rm %s' % dump_file_path)
     return dumpheap_native_parser.Parse(dump_out)
 
   def GetStats(self):
     """Calculate process CPU/VM stats (CPU stats are relative to last call)."""
     # Process must retain its own copy of _last_sys_stats because CPU times
     # are calculated relatively to the last GetStats() call (for the process).
     cur_sys_stats = self.device.UpdateAndGetSystemStats()
     old_sys_stats = self._last_sys_stats or cur_sys_stats
     cur_proc_stats = cur_sys_stats['processes'].get(str(self.pid))
@@ skipping 14 matching lines @@
     proc_stats = backends.ProcessStats(
         threads=cur_proc_stats['n_threads'],
         run_time=run_time,
         cpu_usage=cpu_usage,
         vm_rss=cur_proc_stats['vm_rss'],
         page_faults=(
             (cur_proc_stats['maj_faults'] + cur_proc_stats['min_faults']) -
             (old_proc_stats['maj_faults'] + old_proc_stats['min_faults'])))
     self._last_sys_stats = cur_sys_stats
     return proc_stats