Remove WebBluetoothBlocklist entry from testing config.

Default blocklist values shipped with Chrome 55 onward (added in bug
https://crbug.com/643013) and remaining test value ed5f25a4:e is added
by web_bluetooth_browsertest.cc procedurally as needed if the field
trial config doesn't exist.

Bug: 1126640
Change-Id: I2de2d60ade269680ccf8c2a78a77a9b4d0e5a5f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627376
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Reviewed-by: Vincent Scheib <scheib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843764}

testing/variations/fieldtrial_testing_config.json

@@ -7716,29 +7716,6 @@
             ]
         }
     ],
-    "WebBluetoothBlocklist": [
-        {
-            "platforms": [
-                "android",
-                "android_weblayer",
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "//1": "The value 'ed5f25a4:e' is included for the",
-                    "//2": "WebBluetoothTest BlocklistShouldBlock test.",
-                    "//3": "TODO(643013): Remove other values in Chrome 55 or later.",
-                    "name": "TestGroup",
-                    "params": {
-                        "blocklist_additions": "00060000:e,fffd:e,ed5f25a4:e"
-                    }
-                }
-            ]
-        }
-    ],
     "WebOtpBackendAuto": [
         {
             "platforms": [