Revert "Remove references to crash_service, which is no longer needed."

scripts/slave/recipes/chromium.expected/full_chromium_webrtc_Win7_Tester.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\kill_processes.py"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "taskkill"
   },
@@ skipping 209 matching lines @@
       "gs://test-domain/test-archive.zip",
       "--master-name",
       "chromium.webrtc",
       "--build-number",
       "571"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "extract build"
   },
   {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\chromium\\run_crash_handler.py",
+      "--target",
+      "Release"
+    ],
+    "cwd": "[SLAVE_BUILD]",
+    "name": "start_crash_service"
+  },
+  {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "RECIPE_PACKAGE_REPO[build]\\scripts\\slave\\runtest.py",
       "--target",
       "Release",
       "--factory-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"Win7 Tester\", \"buildnumber\": 571, \"mastername\": \"chromium.webrtc\", \"parent_build_archive_url\": \"gs://test-domain/test-archive.zip\", \"parent_buildername\": \"Win Builder\", \"parent_got_revision\": \"1111111\", \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--build-properties",
@@ skipping 143 matching lines @@
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "process_dumps"
   },
   {
     "name": "$result",
     "recipe_result": null,
     "status_code": 0
   }
 ]