servo: Merge #9349 - Remove unused imports in layout (from therealkbhat:layout-cleanup); r=SimonSapin

Fixes #9346.

Source-Repo: https://github.com/servo/servo
Source-Revision: 2ad562042ba1d80e619286e0d03e8d1fb408779a

servo/components/layout/block.rs

@@ -39,7 +39,7 @@ use flow::{HAS_LEFT_FLOATED_DESCENDANTS, HAS_RIGHT_FLOATED_DESCENDANTS};
 use flow::{IMPACTED_BY_LEFT_FLOATS, IMPACTED_BY_RIGHT_FLOATS, INLINE_POSITION_IS_STATIC};
 use flow::{IS_ABSOLUTELY_POSITIONED};
 use flow::{ImmutableFlowUtils, LateAbsolutePositionInfo, MutableFlowUtils, OpaqueFlow};
-use flow::{NEEDS_LAYER, PostorderFlowTraversal, PreorderFlowTraversal, mut_base};
+use flow::{NEEDS_LAYER, PostorderFlowTraversal, PreorderFlowTraversal};
 use flow::{self, BaseFlow, EarlyAbsolutePositionInfo, Flow, FlowClass, ForceNonfloatedFlag};
 use fragment::{CoordinateSystem, Fragment, FragmentBorderBoxIterator, HAS_LAYER};
 use fragment::{SpecificFragmentInfo};

servo/components/layout/context.rs

@@ -22,7 +22,7 @@ use std::cell::{RefCell, RefMut};
 use std::collections::HashMap;
 use std::collections::hash_state::DefaultState;
 use std::rc::Rc;
-use std::sync::mpsc::{Sender, channel};
+use std::sync::mpsc::Sender;
 use std::sync::{Arc, Mutex};
 use style::context::{LocalStyleContext, SharedStyleContext, StyleContext};
 use style::matching::{ApplicableDeclarationsCache, StyleSharingCandidateCache};

servo/components/layout/display_list_builder.rs

@@ -40,7 +40,6 @@ use net_traits::image::base::{Image, PixelFormat};
 use net_traits::image_cache_thread::UsePlaceholder;
 use std::default::Default;
 use std::sync::Arc;
-use std::sync::mpsc::channel;
 use std::{cmp, f32};
 use style::computed_values::filter::Filter;
 use style::computed_values::{background_attachment, background_clip, background_origin};

servo/components/layout/flex.rs

@@ -16,7 +16,6 @@ use flow;
 use flow::INLINE_POSITION_IS_STATIC;
 use flow::IS_ABSOLUTELY_POSITIONED;
 use flow::ImmutableFlowUtils;
-use flow::mut_base;
 use flow::{Flow, FlowClass, OpaqueFlow};
 use flow::{HAS_LEFT_FLOATED_DESCENDANTS, HAS_RIGHT_FLOATED_DESCENDANTS};
 use fragment::{Fragment, FragmentBorderBoxIterator};