Use the matches! macro from the standard library

Cargo.lock

@@ -3658,7 +3658,6 @@ dependencies = [
  "log",
  "malloc_size_of",
  "malloc_size_of_derive",
- "matches",
  "mime",
  "mime_guess",
  "msg",
@@ -4835,9 +4834,6 @@ dependencies = [
 [[package]]
 name = "script_plugins"
 version = "0.0.1"
-dependencies = [
- "matches",
-]
 
 [[package]]
 name = "script_plugins_tests"
@@ -4906,7 +4902,6 @@ dependencies = [
  "derive_more 0.99.2",
  "fxhash",
  "log",
- "matches",
  "phf",
  "phf_codegen",
  "precomputed-hash",
@@ -5652,7 +5647,6 @@ dependencies = [
  "log",
  "malloc_size_of",
  "malloc_size_of_derive",
- "matches",
  "new_debug_unreachable",
  "num-derive",
  "num-integer",

components/net/Cargo.toml

@@ -37,7 +37,6 @@ libflate = "0.1"
 log = "0.4"
 malloc_size_of = { path = "../malloc_size_of" }
 malloc_size_of_derive = "0.1"
-matches = "0.1"
 mime = "0.3"
 mime_guess = "2.0.0-alpha.6"
 msg = {path = "../msg"}

components/net/lib.rs

@@ -11,8 +11,6 @@ extern crate log;
 #[macro_use]
 extern crate malloc_size_of_derive;
 #[macro_use]
-extern crate matches;
-#[macro_use]
 extern crate profile_traits;
 #[macro_use]
 extern crate serde;

components/script_plugins/Cargo.toml

@@ -11,6 +11,3 @@ plugin = true
 
 [features]
 unrooted_must_root_lint = []
-
-[dependencies]
-matches = "0.1"

components/script_plugins/lib.rs

@@ -19,8 +19,6 @@
 #![feature(rustc_private)]
 #![cfg(feature = "unrooted_must_root_lint")]
 
-#[macro_use]
-extern crate matches;
 extern crate rustc;
 extern crate rustc_driver;
 extern crate rustc_hir;

components/selectors/Cargo.toml

@@ -21,7 +21,6 @@ bench = []
 
 [dependencies]
 bitflags = "1.0"
-matches = "0.1"
 cssparser = "0.27"
 derive_more = "0.99"
 log = "0.4"

components/selectors/lib.rs

@@ -14,8 +14,6 @@ extern crate derive_more;
 extern crate fxhash;
 #[macro_use]
 extern crate log;
-#[macro_use]
-extern crate matches;
 extern crate phf;
 extern crate precomputed_hash;
 extern crate servo_arc;

components/style/Cargo.toml

@@ -50,7 +50,6 @@ lazy_static = "1"
 log = { version = "0.4", features = ["std"] }
 malloc_size_of = { path = "../malloc_size_of" }
 malloc_size_of_derive = "0.1"
-matches = "0.1"
 num_cpus = {version = "1.1.0"}
 num-integer = "0.1"
 num-traits = "0.2"

components/style/lib.rs

@@ -61,9 +61,6 @@ extern crate log;
 extern crate malloc_size_of;
 #[macro_use]
 extern crate malloc_size_of_derive;
-#[allow(unused_extern_crates)]
-#[macro_use]
-extern crate matches;
 #[cfg(feature = "gecko")]
 pub extern crate nsstring;
 #[cfg(feature = "gecko")]