Revert of [chromecast] Make testnames consistent.

testing/buildbot/chromium.linux.json

 {
   "Android Arm64 Builder (dbg)": {
     "additional_compile_targets": [
       "all"
     ]
   },
   "Android Builder": {
     "additional_compile_targets": [
       "cronet_test_instrumentation_apk",
       "system_webview_apk"
@@ skipping 2686 matching lines @@
       {
         "args": [
           "--enable-local-file-accesses",
           "--ozone-platform=cast",
           "--no-sandbox",
           "--test-launcher-jobs=1"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true
         },
-        "test": "cast_shell_browsertests"
+        "test": "cast_shell_browser_test"
       },
       {
         "swarming": {
           "can_use_on_swarming_builders": true
         },
         "test": "cast_shell_unittests"
       },
       {
         "args": [
           "--test-launcher-filter-file=src/testing/buildbot/filters/cast-linux.content_browsertests.filter"
@@ skipping 1658 matching lines @@
         "override_compile_targets": [
           "telemetry_unittests_run"
         ],
         "swarming": {
           "can_use_on_swarming_builders": true
         }
       }
     ]
   }
 }