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

scripts/slave/recipes/chromium.expected/full_chromium_android_Android_WebView_CTS_L_MR1__dbg_.json

Index: scripts/slave/recipes/chromium.expected/full_chromium_android_Android_WebView_CTS_L_MR1__dbg_.json
diff --git a/scripts/slave/recipes/chromium.expected/full_chromium_android_Android_WebView_CTS_L_MR1__dbg_.json b/scripts/slave/recipes/chromium.expected/full_chromium_android_Android_WebView_CTS_L_MR1__dbg_.json
index 1cca78db12a0bcc83caec95aa8bdb0f61723f8b8..d957d22d696c882b52a0308111426cf64417b71e 100644
--- a/scripts/slave/recipes/chromium.expected/full_chromium_android_Android_WebView_CTS_L_MR1__dbg_.json
+++ b/scripts/slave/recipes/chromium.expected/full_chromium_android_Android_WebView_CTS_L_MR1__dbg_.json
@@ -551,7 +551,7 @@
     "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_WebView_CTS_L_MR1__dbg_/src/chrome/VERSION",
       "/path/to/tmp/"
     ],
@@ -583,7 +583,7 @@
     "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_WebView_CTS_L_MR1__dbg_/src/android_webview/tools/cts_config/webview_cts_gcs_path.json",
       "/path/to/tmp/"
     ],
@@ -598,7 +598,7 @@
     "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_WebView_CTS_L_MR1__dbg_/src/android_webview/tools/cts_config/expected_failure_on_bot.json",
       "/path/to/tmp/"
     ],
@@ -819,7 +819,7 @@
     "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_WebView_CTS_L_MR1__dbg_/src/chrome/VERSION",
       "/path/to/tmp/"
     ],