Revert of Add gtest_tests dictionaries for a single Linux debug tester....

Revert of Add gtest_tests dictionaries for a single Linux debug tester. (patchset #2 id:40001 of https://codereview.chromium.org/599993003/)

Reason for revert:
reverting per new approach I'm taking in https://codereview.chromium.org/602963002/

Original issue's description:
> Add gtest_tests dictionaries for a single Linux debug tester.
>
> This has to be landed first. After the recipe change, I'll remove the old ones.
>
> BUG=414808
> R=phajdan.jr@chromium.org
>
> Committed: https://chromium.googlesource.com/chromium/src/+/4d2bfd854ee6282d8a9af0722c205689d989001a

TBR=phajdan.jr@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=414808

Review URL: https://codereview.chromium.org/610943002

Cr-Commit-Position: refs/heads/master@{#297141}

testing/buildbot/chromium.linux.json

@@ -160,106 +160,6 @@
       "wm_unittests"
     ]
   },
-  "Linux Tests (dbg)": {
-    "gtest_tests": [
-      "accessibility_unittests",
-      "app_list_unittests",
-      "app_shell_browsertests",
-      "aura_unittests",
-      {
-        "test": "base_unittests",
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        }
-      },
-      {
-        "test": "browser_tests",
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "shards": 10
-        }
-      },
-      "cacheinvalidation_unittests",
-      "cast_unittests",
-      "cc_unittests",
-      "chromedriver_unittests",
-      "components_unittests",
-      "compositor_unittests",
-      {
-        "test": "content_browsertests",
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        }
-      },
-      {
-        "test": "content_unittests",
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        }
-      },
-      "crypto_unittests",
-      "dbus_unittests",
-      "device_unittests",
-      "display_unittests",
-      "events_unittests",
-      "extensions_unittests",
-      "gcm_unit_tests",
-      "gfx_unittests",
-      "google_apis_unittests",
-      "gpu_unittests",
-      {
-        "test": "interactive_ui_tests",
-        "swarming": {
-          "can_use_on_swarming_builders": true,
-          "shards": 3
-        }
-      },
-      "ipc_mojo_unittests",
-      "ipc_tests",
-      "jingle_unittests",
-      "media_unittests",
-      "mojo_application_manager_unittests",
-      "mojo_apps_js_unittests",
-      "mojo_common_unittests",
-      "mojo_js_unittests",
-      "mojo_public_bindings_unittests",
-      "mojo_public_environment_unittests",
-      "mojo_public_system_unittests",
-      "mojo_public_utility_unittests",
-      "mojo_shell_tests",
-      "mojo_system_unittests",
-      "mojo_view_manager_unittests",
-      "nacl_loader_unittests",
-      {
-        "test": "net_unittests",
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        }
-      },
-      "ppapi_unittests",
-      "printing_unittests",
-      "remoting_unittests",
-      "sandbox_linux_unittests",
-      "sql_unittests",
-      "ui_unittests",
-      {
-        "test": "sync_integration_tests",
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        }
-      },
-      "sync_unit_tests",
-      {
-        "test": "unit_tests",
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        }
-      },
-      "url_unittests",
-      "views_unittests",
-      "wm_unittests"
-    ]
-  },
   "Linux Tests (dbg)(1)": {
     "gtest_tests": [
     ]