Enable isolate on Linux release builder.

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

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "chromium.linux",
       "--builder",
       "Linux Builder (dbg)",
@@ skipping 126 matching lines @@
     "name": "checkdeps",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@[]@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[BUILD]/scripts/slave/recipe_modules/isolate/resources/find_isolated_tests.py",
-      "--build-dir",
-      "[SLAVE_BUILD]/src/out/Debug",
-      "--output-json",
-      "/path/to/tmp/json"
-    ],
-    "name": "find isolated tests",
-    "~followup_annotations": [
-      "@@@STEP_LOG_LINE@json.output@{@@@",
-      "@@@STEP_LOG_LINE@json.output@  \"dummy_target_1\": \"[dummy hash for dummy_target_1]\", @@@",
-      "@@@STEP_LOG_LINE@json.output@  \"dummy_target_2\": \"[dummy hash for dummy_target_2]\"@@@",
-      "@@@STEP_LOG_LINE@json.output@}@@@",
-      "@@@STEP_LOG_END@json.output@@@",
-      "@@@SET_BUILD_PROPERTY@swarm_hashes@{\"dummy_target_1\": \"[dummy hash for dummy_target_1]\", \"dummy_target_2\": \"[dummy hash for dummy_target_2]\"}@@@"
-    ]
-  },
-  {
-    "cmd": [
-      "python",
-      "-u",
       "[BUILD]/scripts/slave/archive_dependencies.py",
       "--src-dir",
       "[SLAVE_BUILD]/src",
       "--target",
       "Debug",
       "--master",
       "chromium.linux",
       "--builder",
       "Linux Builder (dbg)",
       "--build",
@@ skipping 14 matching lines @@
       "--build_revision",
       "170242",
       "--factory-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"Linux Builder (dbg)\", \"buildnumber\": 571, \"mastername\": \"chromium.linux\", \"parent_buildername\": null, \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--build-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"Linux Builder (dbg)\", \"buildnumber\": 571, \"mastername\": \"chromium.linux\", \"parent_buildername\": null, \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}"
     ],
     "name": "package build"
   }
 ]