Remove kExperimentalTestNameMetadataKey metric metadata key.

Change-Id: Ifc81aafd0182ca299bd649eef01c360d516c93c0
Bug: webrtc:42225051
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/384360
Commit-Queue: Jeremy Leconte <jleconte@webrtc.org>
Reviewed-by: Manashi Sarkar <manashi@google.com>
Cr-Commit-Position: refs/heads/main@{#44306}
diff --git a/test/pc/e2e/metric_metadata_keys.h b/test/pc/e2e/metric_metadata_keys.h
index fbcd3b9..fd27d90 100644
--- a/test/pc/e2e/metric_metadata_keys.h
+++ b/test/pc/e2e/metric_metadata_keys.h
@@ -10,7 +10,6 @@
 #ifndef TEST_PC_E2E_METRIC_METADATA_KEYS_H_
 #define TEST_PC_E2E_METRIC_METADATA_KEYS_H_
 
-#include <string>
 
 namespace webrtc {
 namespace webrtc_pc_e2e {
@@ -30,13 +29,6 @@
   static constexpr char kVideoStreamMetadataKey[] = "video_stream";
   // Represents name of the sync group to which stream belongs.
   static constexpr char kPeerSyncGroupMetadataKey[] = "peer_sync_group";
-  // Represents the test name (without any peer and stream data appended to it
-  // as it currently happens with the webrtc.test_metrics.Metric.test_case
-  // field). This metadata is temporary and it will be removed once this
-  // information is moved to webrtc.test_metrics.Metric.test_case.
-  // TODO(bugs.webrtc.org/14757): Remove kExperimentalTestNameMetadataKey.
-  static constexpr char kExperimentalTestNameMetadataKey[] =
-      "experimental_test_name";
   // Represents index of a video spatial layer to which metric belongs.
   static constexpr char kSpatialLayerMetadataKey[] = "spatial_layer";