Revert all of the run-webkit-test wrapper changes from this weekend.

scripts/slave/recipes/chromium.expected/full_chromium_webkit_WebKit_Win10.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\kill_processes.py"
     ],
     "name": "taskkill"
   },
   {
@@ skipping 370 matching lines @@
       "@@@STEP_LOG_LINE@json.output@  }@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@",
       "@@@STEP_LINK@shard #0@https://chromium-swarm.appspot.com/user/task/10000@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "[SLAVE_BUILD]\\src\\third_party\\WebKit\\Tools\\Scripts\\run-webkit-tests",
+      "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\runtest.py",
       "--target",
       "Release",
-      "--results-directory",
+      "--factory-properties",
+      "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"build_data_dir\": \"[ROOT]\\\\build_data_dir\", \"buildername\": \"WebKit Win10\", \"buildnumber\": 571, \"gs_acl\": \"public-read\", \"mastername\": \"chromium.webkit\", \"parent_build_archive_url\": \"gs://test-domain/test-archive.zip\", \"parent_buildername\": \"WebKit Win Builder\", \"parent_got_revision\": \"1111111\", \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"swarm_hashes\": {\"browser_tests\": \"ffffffffffffffffffffffffffffffffffffffff\"}, \"workdir\": \"/path/to/workdir/TestSlavename\"}",
+      "--build-properties",
+      "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"build_data_dir\": \"[ROOT]\\\\build_data_dir\", \"buildername\": \"WebKit Win10\", \"buildnumber\": 571, \"gs_acl\": \"public-read\", \"mastername\": \"chromium.webkit\", \"parent_build_archive_url\": \"gs://test-domain/test-archive.zip\", \"parent_buildername\": \"WebKit Win Builder\", \"parent_got_revision\": \"1111111\", \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"swarm_hashes\": {\"browser_tests\": \"ffffffffffffffffffffffffffffffffffffffff\"}, \"workdir\": \"/path/to/workdir/TestSlavename\"}",
+      "--step-name=webkit_tests",
+      "--builder-name=WebKit Win10",
+      "--slave-name=TestSlavename",
+      "--build-number=571",
+      "--run-python-script",
+      "[BUILD]\\scripts\\slave\\chromium\\layout_test_wrapper.py",
+      "--target",
+      "Release",
+      "-o",
       "[SLAVE_BUILD]\\layout-test-results",
       "--build-dir",
       "[SLAVE_BUILD]\\src\\out",
       "--json-test-results",
       "/path/to/tmp/json",
       "--test-results-server",
       "test-results.appspot.com",
       "--build-number",
       "571",
       "--builder-name",
       "WebKit Win10",
       "--step-name",
-      "webkit_tests",
-      "--master-name",
-      "chromium.webkit",
-      "--debug-rwt-logging"
+      "webkit_tests"
     ],
     "name": "webkit_tests",
     "~followup_annotations": [
       "@@@STEP_TEXT@<br/>Total executed: 9001<br/>@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
@@ skipping 77 matching lines @@
       "Release"
     ],
     "name": "process_dumps"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]