Revert of Swarm tests on Linux release tester.

testing/buildbot/chromium.linux.json

 {
   "Linux Tests": {
     "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": 5
-        }
-      },
+      "base_unittests",
+      "browser_tests",
       "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
-        }
-      },
+      "content_browsertests",
+      "content_unittests",
       "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
-        }
-      },
+      "interactive_ui_tests",
       "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
-        }
-      },
+      "net_unittests",
       "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_integration_tests",
       "sync_unit_tests",
-      {
-        "test": "unit_tests",
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        }
-      },
+      "unit_tests",
       "url_unittests",
       "views_unittests",
       "wm_unittests"
     ]
   },
   "Linux Tests (dbg)(1)(32)": {
     "gtest_tests": [
       "browser_tests"
     ]
   },
@@ skipping 121 matching lines @@
       "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
-        }
-      },
+      "net_unittests",
       "ppapi_unittests",
       "printing_unittests",
       "remoting_unittests",
       "sandbox_linux_unittests",
       "sql_unittests",
       "ui_unittests",
       {
         "test": "sync_integration_tests",
         "swarming": {
           "can_use_on_swarming_builders": true
@@ skipping 37 matching lines @@
       "mojo_view_manager_unittests",
       "nacl_loader_unittests",
       "sandbox_linux_unittests",
       "sql_unittests",
       "sync_unit_tests",
       "ui_unittests",
       "unit_tests"
     ]
   }
 }