Remove most of the things in layout 2020

We keep mostly the query system. There is probably more to delete but
that's a good start I think.

components/layout_2020/Cargo.toml

@@ -14,46 +14,21 @@ doctest = false
 
 [dependencies]
 app_units = "0.7"
-atomic_refcell = "0.1"
-bitflags = "1.0"
-canvas_traits = {path = "../canvas_traits"}
-crossbeam-channel = "0.3"
-embedder_traits = {path = "../embedder_traits"}
 euclid = "0.19"
 fnv = "1.0"
-fxhash = "0.2"
 gfx = {path = "../gfx"}
 gfx_traits = {path = "../gfx_traits"}
-html5ever = "0.23"
 ipc-channel = "0.11"
 libc = "0.2"
-log = "0.4"
 malloc_size_of = { path = "../malloc_size_of" }
 msg = {path = "../msg"}
-net_traits = {path = "../net_traits"}
-num-traits = "0.2"
-ordered-float = "1.0"
-parking_lot = "0.8"
-profile_traits = {path = "../profile_traits"}
 range = {path = "../range"}
 rayon = "1"
 script_layout_interface = {path = "../script_layout_interface"}
 script_traits = {path = "../script_traits"}
-selectors = { path = "../selectors" }
 serde = "1.0"
 servo_arc = {path = "../servo_arc"}
-servo_atoms = {path = "../atoms"}
-servo_geometry = {path = "../geometry"}
-serde_json = "1.0"
-servo_config = {path = "../config"}
 servo_url = {path = "../url"}
-smallvec = { version = "0.6", features = ["std", "union"] }
 style = {path = "../style", features = ["servo", "servo-layout-2020"]}
 style_traits = {path = "../style_traits"}
-unicode-bidi = {version = "0.3", features = ["with_serde"]}
-unicode-script = {version = "0.3", features = ["harfbuzz"]}
 webrender_api = {git = "https://github.com/servo/webrender", features = ["ipc"]}
-xi-unicode = "0.1.0"
-
-[dev-dependencies]
-size_of_test = {path = "../size_of_test"}