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

scripts/slave/recipes/bisection/android_bisect.expected/basic_perf_tryjob_with_metric_android_s5_perf_cq.json

Index: scripts/slave/recipes/bisection/android_bisect.expected/basic_perf_tryjob_with_metric_android_s5_perf_cq.json
diff --git a/scripts/slave/recipes/bisection/android_bisect.expected/basic_perf_tryjob_with_metric_android_s5_perf_cq.json b/scripts/slave/recipes/bisection/android_bisect.expected/basic_perf_tryjob_with_metric_android_s5_perf_cq.json
index 5e8cf2e855ba9a0573f1961c4854010e44763585..eaf24c1faa91026c107b94eb35e08561850abfee 100644
--- a/scripts/slave/recipes/bisection/android_bisect.expected/basic_perf_tryjob_with_metric_android_s5_perf_cq.json
+++ b/scripts/slave/recipes/bisection/android_bisect.expected/basic_perf_tryjob_with_metric_android_s5_perf_cq.json
@@ -668,7 +668,7 @@
     "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",
       "[BUILDER_CACHE]/android_s5_perf_cq/src/chrome/VERSION",
       "/path/to/tmp/"
     ],
@@ -1017,7 +1017,7 @@
     "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",
       "[BUILDER_CACHE]/android_s5_perf_cq/src/chrome/VERSION",
       "/path/to/tmp/"
     ],
@@ -1297,7 +1297,7 @@
     "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",
       "[BUILDER_CACHE]/android_s5_perf_cq/src/chrome/VERSION",
       "/path/to/tmp/"
     ],