Make .pyc cleaning optional in clean_local_files.

scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_android_rel.json

Index: scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_android_rel.json
diff --git a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_android_rel.json b/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_android_rel.json
index b2b4f371c26206db853b32905bf1cc7db4d95ce4..6b05a6e9bd677b6a64c0b0e98083a65cd6ab457c 100644
--- a/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_android_rel.json
+++ b/scripts/slave/recipes/webrtc/standalone.expected/tryserver_webrtc_android_rel.json
@@ -91,7 +91,7 @@
     "cmd": [
       "python",
       "-u",
-      "\nimport shutil, sys, os\nshutil.rmtree(sys.argv[1], True)\nshutil.rmtree(sys.argv[2], True)\ntry:\n  os.remove(sys.argv[3])\nexcept OSError:\n  pass\nfor base, _dirs, files in os.walk(sys.argv[4]):\n  for f in files:\n    if f.endswith('.pyc'):\n      os.remove(os.path.join(base, f))\n",
+      "\nimport shutil, sys, os\nshutil.rmtree(sys.argv[1], True)\nshutil.rmtree(sys.argv[2], True)\ntry:\n  os.remove(sys.argv[3])\nexcept OSError:\n  pass\n",
       "[BUILDER_CACHE]/android_rel/src/out/Release/debug_info_dumps",
       "[BUILDER_CACHE]/android_rel/src/out/Release/test_logs",
       "[BUILDER_CACHE]/android_rel/src/out/build_product.zip",
@@ -107,10 +107,6 @@
       "@@@STEP_LOG_LINE@python.inline@  os.remove(sys.argv[3])@@@",
       "@@@STEP_LOG_LINE@python.inline@except OSError:@@@",
       "@@@STEP_LOG_LINE@python.inline@  pass@@@",
-      "@@@STEP_LOG_LINE@python.inline@for base, _dirs, files in os.walk(sys.argv[4]):@@@",
-      "@@@STEP_LOG_LINE@python.inline@  for f in files:@@@",
-      "@@@STEP_LOG_LINE@python.inline@    if f.endswith('.pyc'):@@@",
-      "@@@STEP_LOG_LINE@python.inline@      os.remove(os.path.join(base, f))@@@",
       "@@@STEP_LOG_END@python.inline@@@"
     ]
   },