Bug 1772962 - Force the url crate to stay at 2.1.0. r=markh

Differential Revision: https://phabricator.services.mozilla.com/D148464

Cargo.lock

@@ -2091,6 +2091,7 @@ dependencies = [
  "tokio-threadpool",
  "unic-langid",
  "unic-langid-ffi",
+ "url",
  "viaduct",
  "webext_storage_bridge",
  "webrender_bindings",

toolkit/library/rust/shared/Cargo.toml

@@ -86,6 +86,9 @@ localization-ffi = { path = "../../../../intl/l10n/rust/localization-ffi" }
 processtools = { path = "../../../components/processtools" }
 qcms = { path = "../../../../gfx/qcms", features = ["c_bindings", "neon"], default-features = false }
 
+# Force url to stay at 2.1.0. See bug 1734538.
+url = "=2.1.0"
+
 [target.'cfg(not(target_os = "android"))'.dependencies]
 viaduct = "0.1"
 webext_storage_bridge = { path = "../../../components/extensions/storage/webext_storage_bridge" }