Simplify TOML syntax

* Sections like `[dependencies.foo]` can be entries in a `[dependencies]`
  section with the `{key = value}` syntax.
* Per-target dependencies can be expressed with more general `cfg(…)`
  conditions instead of exact target triples:
  https://github.com/rust-lang/cargo/pull/2328

components/msg/Cargo.toml

@@ -8,23 +8,12 @@ publish = false
 name = "msg"
 path = "lib.rs"
 
-[dependencies.util]
-path = "../util"
-
-[dependencies.layers]
-git = "https://github.com/servo/rust-layers"
-features = ["plugins"]
-
-[dependencies.ipc-channel]
-git = "https://github.com/servo/ipc-channel"
-
-[dependencies.plugins]
-path = "../plugins"
-
-[dependencies.webrender_traits]
-git = "https://github.com/servo/webrender_traits"
-
 [dependencies]
+util = {path = "../util"}
+layers = {git = "https://github.com/servo/rust-layers", features = ["plugins"]}
+ipc-channel = {git = "https://github.com/servo/ipc-channel"}
+plugins = {path = "../plugins"}
+webrender_traits = {git = "https://github.com/servo/webrender_traits"}
 bitflags = "0.3"
 cssparser = {version = "0.5.4", features = ["heap_size", "serde-serialization"]}
 euclid = {version = "0.6.4", features = ["plugins"]}