style: Remove some redundant use statements.

components/style/gecko/conversions.rs

@@ -418,10 +418,8 @@ impl nsStyleImage {
         use self::structs::NS_STYLE_GRADIENT_SIZE_CLOSEST_SIDE as CLOSEST_SIDE;
         use self::structs::NS_STYLE_GRADIENT_SIZE_FARTHEST_CORNER as FARTHEST_CORNER;
         use self::structs::NS_STYLE_GRADIENT_SIZE_FARTHEST_SIDE as FARTHEST_SIDE;
-        use crate::values::computed::image::LineDirection;
         use crate::values::computed::position::Position;
-        use crate::values::computed::Length;
+        use crate::values::generics::image::{Circle, ColorStop, Ellipse};
-        use crate::values::generics::image::{Circle, ColorStop, CompatMode, Ellipse};
         use crate::values::generics::image::{EndingShape, GradientKind, ShapeExtent};
 
         let gecko_gradient = bindings::Gecko_GetGradientImageValue(self)
@@ -834,8 +832,7 @@ impl TrackSize<LengthPercentage> {
     /// Return TrackSize from given two nsStyleCoord
     pub fn from_gecko_style_coords<T: CoordData>(gecko_min: &T, gecko_max: &T) -> Self {
         use crate::gecko_bindings::structs::root::nsStyleUnit;
-        use crate::values::computed::length::LengthPercentage;
+        use crate::values::generics::grid::TrackBreadth;
-        use crate::values::generics::grid::{TrackBreadth, TrackSize};
 
         if gecko_min.unit() == nsStyleUnit::eStyleUnit_None {
             debug_assert!(
@@ -862,8 +859,6 @@ impl TrackSize<LengthPercentage> {
 
     /// Save TrackSize to given gecko fields.
     pub fn to_gecko_style_coords<T: CoordDataMut>(&self, gecko_min: &mut T, gecko_max: &mut T) {
-        use crate::values::generics::grid::TrackSize;
-
         match *self {
             TrackSize::FitContent(ref lop) => {
                 // Gecko sets min value to None and max value to the actual value in fit-content
@@ -893,8 +888,6 @@ impl TrackListValue<LengthPercentage, Integer> {
 
     /// Save TrackSize to given gecko fields.
     pub fn to_gecko_style_coords<T: CoordDataMut>(&self, gecko_min: &mut T, gecko_max: &mut T) {
-        use crate::values::generics::grid::TrackListValue;
-
         match *self {
             TrackListValue::TrackSize(ref size) => size.to_gecko_style_coords(gecko_min, gecko_max),
             _ => unreachable!("Should only transform from track-size computed values"),
@@ -918,8 +911,6 @@ where
     pub fn from_gecko_rect(
         sides: &crate::gecko_bindings::structs::nsStyleSides,
     ) -> Option<crate::values::generics::rect::Rect<T>> {
-        use crate::values::generics::rect::Rect;
-
         Some(Rect::new(
             T::from_gecko_style_coord(&sides.data_at(0)).expect("coord[0] cound not convert"),
             T::from_gecko_style_coord(&sides.data_at(1)).expect("coord[1] cound not convert"),

components/style/gecko/values.rs

@@ -317,7 +317,6 @@ impl GeckoStyleCoordConvertible for ScrollSnapPoint<LengthPercentage> {
 
     fn from_gecko_style_coord<T: CoordData>(coord: &T) -> Option<Self> {
         use crate::gecko_bindings::structs::root::nsStyleUnit;
-        use crate::values::generics::gecko::ScrollSnapPoint;
 
         Some(match coord.unit() {
             nsStyleUnit::eStyleUnit_None => ScrollSnapPoint::None,

components/style/gecko/wrapper.rs

@@ -986,7 +986,6 @@ fn get_animation_rule(
     element: &GeckoElement,
     cascade_level: CascadeLevel,
 ) -> Option<Arc<Locked<PropertyDeclarationBlock>>> {
-    use crate::gecko_bindings::sugar::ownership::HasSimpleFFI;
     use crate::properties::longhands::ANIMATABLE_PROPERTY_COUNT;
 
     // There's a very rough correlation between the number of effects

components/style/rule_tree/mod.rs

@@ -1239,7 +1239,7 @@ impl StrongRuleNode {
         use crate::gecko_bindings::structs::NS_AUTHOR_SPECIFIED_BACKGROUND;
         use crate::gecko_bindings::structs::NS_AUTHOR_SPECIFIED_BORDER;
         use crate::gecko_bindings::structs::NS_AUTHOR_SPECIFIED_PADDING;
-        use crate::properties::{CSSWideKeyword, LonghandId, LonghandIdSet};
+        use crate::properties::{CSSWideKeyword, LonghandId};
         use crate::properties::{PropertyDeclaration, PropertyDeclarationId};
         use crate::values::specified::Color;
         use std::borrow::Cow;

components/style/stylesheet_set.rs

@@ -211,8 +211,6 @@ where
     type Item = (&'a S, SheetRebuildKind);
 
     fn next(&mut self) -> Option<Self::Item> {
-        use std::mem;
-
         loop {
             let potential_sheet = self.iter.next()?;
 

components/style/traversal.rs

@@ -307,8 +307,6 @@ pub fn resolve_style<E>(
 where
     E: TElement,
 {
-    use crate::style_resolver::StyleResolverForElement;
-
     debug_assert!(
         rule_inclusion == RuleInclusion::DefaultOnly ||
             pseudo.map_or(false, |p| p.is_before_or_after()) ||
@@ -406,7 +404,6 @@ pub fn recalc_style_at<E, D, F>(
     D: DomTraversal<E>,
     F: FnMut(E::ConcreteNode),
 {
-    use crate::traversal_flags::TraversalFlags;
     use std::cmp;
 
     let flags = context.shared.traversal_flags;

components/style/values/generics/font.rs

@@ -118,7 +118,7 @@ impl ToCss for FontTag {
     where
         W: Write,
     {
-        use byteorder::{BigEndian, ByteOrder};
+        use byteorder::ByteOrder;
         use std::str;
 
         let mut raw = [0u8; 4];