Remove http.headers.Link.blocking (#27145)

This was implemented and has since been removed from the only browser that implemented it more than two years ago, and thus qualifies for removal per policy.

Co-authored-by: Claas Augner <495429+caugner@users.noreply.github.com>

Author: gsnedders

http/headers/Link.json

@@ -32,43 +32,6 @@
             "deprecated": false
           }
         },
-        "blocking": {
-          "__compat": {
-            "spec_url": "https://html.spec.whatwg.org/multipage/semantics.html#attr-link-blocking",
-            "tags": [
-              "web-features:blocking-render"
-            ],
-            "support": {
-              "chrome": {
-                "version_added": "103",
-                "version_removed": "105"
-              },
-              "chrome_android": "mirror",
-              "edge": "mirror",
-              "firefox": {
-                "version_added": false,
-                "impl_url": "https://bugzil.la/1751383"
-              },
-              "firefox_android": "mirror",
-              "oculus": "mirror",
-              "opera": "mirror",
-              "opera_android": "mirror",
-              "safari": {
-                "version_added": false,
-                "impl_url": "https://webkit.org/b/267232"
-              },
-              "safari_ios": "mirror",
-              "samsunginternet_android": "mirror",
-              "webview_android": "mirror",
-              "webview_ios": "mirror"
-            },
-            "status": {
-              "experimental": true,
-              "standard_track": true,
-              "deprecated": false
-            }
-          }
-        },
         "fetchpriority": {
           "__compat": {
             "spec_url": "https://html.spec.whatwg.org/multipage/semantics.html#attr-link-fetchpriority",