Only build base_unittests and net_unittests on ChromiumOS GN (dbg).

We can actually build a lot more targets, but the full
component build doesn't work yet. This patch reverts
the changes in #326948 for just this configuration in
the meantime.

TBR=phajdan.jr@chromium.org
BUG=461019, 480643

Review URL: https://codereview.chromium.org/1055403009

Cr-Commit-Position: refs/heads/master@{#326955}

testing/buildbot/chromium.chromiumos.json

@@ -58,54 +58,7 @@
   },
   "Linux ChromiumOS GN (dbg)": {
     "additional_compile_targets": [
-      "accessibility_unittests",
-      "app_list_unittests",
-      "aura_unittests",
-      "browser_tests",
-      "cacheinvalidation_unittests",
-      "chromedriver_unittests",
-      "chromeos_unittests",
-      "components_browsertests",
-      "components_unittests",
-      "content_browsertests",
-      "content_unittests",
-      "crypto_unittests",
-      "dbus_unittests",
-      "device_unittests",
-      "display_unittests",
-      "events_unittests",
-      "extensions_browsertests",
-      "extensions_unittests",
-      "gcm_unit_tests",
-      "gfx_unittests",
-      "gn_unittests",
-      "google_apis_unittests",
-      "gpu_unittests",
-      "interactive_ui_tests",
-      "ipc_tests",
-      "jingle_unittests",
-      "media_unittests",
-      "mojo_common_unittests",
-      "mojo_public_bindings_unittests",
-      "mojo_public_environment_unittests",
-      "mojo_public_system_unittests",
-      "mojo_public_utility_unittests",
-      "mojo_system_unittests",
-      "net_unittests",
-      "ppapi_unittests",
-      "printing_unittests",
-      "remoting_unittests",
-      "sandbox_linux_unittests",
-      "skia_unittests",
-      "sql_unittests",
-      "sync_unit_tests",
-      "ui_base_unittests",
-      "ui_chromeos_unittests",
-      "ui_touch_selection_unittests",
-      "unit_tests",
-      "url_unittests",
-      "views_unittests",
-      "wm_unittests"
+      "net_unittests"
     ],
     "gtest_tests": [
       {

testing/buildbot/tryserver.chromium.linux.json

@@ -13,54 +13,7 @@
   },
   "linux_chromium_gn_chromeos_dbg": {
     "additional_compile_targets": [
-      "accessibility_unittests",
-      "app_list_unittests",
-      "aura_unittests",
-      "browser_tests",
-      "cacheinvalidation_unittests",
-      "chromedriver_unittests",
-      "chromeos_unittests",
-      "components_browsertests",
-      "components_unittests",
-      "content_browsertests",
-      "content_unittests",
-      "crypto_unittests",
-      "dbus_unittests",
-      "device_unittests",
-      "display_unittests",
-      "events_unittests",
-      "extensions_browsertests",
-      "extensions_unittests",
-      "gcm_unit_tests",
-      "gfx_unittests",
-      "gn_unittests",
-      "google_apis_unittests",
-      "gpu_unittests",
-      "interactive_ui_tests",
-      "ipc_tests",
-      "jingle_unittests",
-      "media_unittests",
-      "mojo_common_unittests",
-      "mojo_public_bindings_unittests",
-      "mojo_public_environment_unittests",
-      "mojo_public_system_unittests",
-      "mojo_public_utility_unittests",
-      "mojo_system_unittests",
-      "net_unittests",
-      "ppapi_unittests",
-      "printing_unittests",
-      "remoting_unittests",
-      "sandbox_linux_unittests",
-      "skia_unittests",
-      "sql_unittests",
-      "sync_unit_tests",
-      "ui_base_unittests",
-      "ui_chromeos_unittests",
-      "ui_touch_selection_unittests",
-      "unit_tests",
-      "url_unittests",
-      "views_unittests",
-      "wm_unittests"
+      "net_unittests"
     ],
     "gtest_tests": [
       {