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

scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux_ASAN_arm___debug_builder.json

Index: scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux_ASAN_arm___debug_builder.json
diff --git a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux_ASAN_arm___debug_builder.json b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux_ASAN_arm___debug_builder.json
index 7f905f273ea1dd93f45a5933d740f67a4d665c2a..a04823a247bc9a94bd20d67188f985c0d01455fc 100644
--- a/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux_ASAN_arm___debug_builder.json
+++ b/scripts/slave/recipes/v8.expected/full_client_v8_V8_Linux_ASAN_arm___debug_builder.json
@@ -332,7 +332,7 @@
     "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",
       "[SLAVE_BUILD]/v8/third_party/llvm-build/Release+Asserts/bin/llvm-symbolizer",
       "[SLAVE_BUILD]/v8/out/Debug"
     ],
@@ -342,7 +342,7 @@
     "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",
       "[SLAVE_BUILD]/v8/third_party/llvm-build/Release+Asserts/bin/sancov",
       "[SLAVE_BUILD]/v8/out/Debug"
     ],