Revert "Fix file.copy recipe_module to not fail if files are already equal."

scripts/slave/recipe_modules/chromium_android/example.expected/telemetry_browser_tests_failures.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "\nimport os, sys\n\nbuild_path = sys.argv[1]\nif os.path.exists(build_path):\n  for (path, dir, files) in os.walk(build_path):\n    for cur_file in files:\n      if cur_file.endswith('index.lock'):\n        path_to_file = os.path.join(path, cur_file)\n        print 'deleting %s' % path_to_file\n        os.remove(path_to_file)\n",
       "[SLAVE_BUILD]"
     ],
     "name": "cleanup index.lock",
     "~followup_annotations": [
@@ skipping 170 matching lines @@
       "src",
       "foo",
       "src/repo"
     ],
     "name": "tree truth steps"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "\nimport shutil\nimport sys\n# Apparently, shutil.copy fails if files are binary-equal on *nix OSes.\n# See http://crbug.com/636168#c8.\nif hasattr(shutil, '_samefile'):\n  if shutil._samefile(sys.argv[1], sys.argv[2]):\n    sys.exit(0)\nshutil.copy(sys.argv[1], sys.argv[2])\n",
+      "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
       "[SLAVE_BUILD]/src/chrome/VERSION",
       "/path/to/tmp/"
     ],
     "name": "get version"
   },
   {
     "cmd": [
       "[SLAVE_BUILD]/src/testing/scripts/host_info.py",
       "--args",
       "[\"--known-devices-file\", \"[HOME]/.android/known_devices.json\"]",
@@ skipping 437 matching lines @@
     ]
   },
   {
     "cmd": [],
     "name": "fix_device_file_format"
   },
   {
     "cmd": [
       "python",
       "-u",
-      "\nimport shutil\nimport sys\n# Apparently, shutil.copy fails if files are binary-equal on *nix OSes.\n# See http://crbug.com/636168#c8.\nif hasattr(shutil, '_samefile'):\n  if shutil._samefile(sys.argv[1], sys.argv[2]):\n    sys.exit(0)\nshutil.copy(sys.argv[1], sys.argv[2])\n",
+      "\nimport shutil\nimport sys\nshutil.copy(sys.argv[1], sys.argv[2])\n",
       "[HOME]/.android/known_devices.json",
       "/path/to/tmp/"
     ],
     "name": "fix_device_file_format.read_device_file",
     "~followup_annotations": [
       "@@@STEP_NEST_LEVEL@1@@@",
       "@@@STEP_TEXT@file format is compatible@@@"
     ]
   },
   {
@@ skipping 272 matching lines @@
       "@@@STEP_FAILURE@@@"
     ]
   },
   {
     "name": "$result",
     "reason": "Step('Run telemetry browser_test PopularUrlsTest') failed with return_code 1",
     "recipe_result": null,
     "status_code": 1
   }
 ]