Avoid explicit calls to 'iter' and 'iter_mut'.

src/frame.rs

@@ -514,7 +514,7 @@ impl StackingContextHelpers for StackingContext {
         if self.needs_composition_operation_for_mix_blend_mode() {
             composition_operations.push(CompositionOp::MixBlend(self.mix_blend_mode));
         }
-        for filter in self.filters.iter() {
+        for filter in &self.filters {
             match *filter {
                 FilterOp::Blur(radius) => {
                     composition_operations.push(CompositionOp::Filter(LowLevelFilterOp::Blur(

src/renderer.rs

@@ -894,7 +894,7 @@ impl Renderer {
                                    f: F)
                                    where F: Fn(&Rect<f32>) -> [PackedVertexForTextureCacheUpdate; 4] {
         // FIXME(pcwalton): Use a hash table if this linear search shows up in the profile.
-        for batch in self.raster_batches.iter_mut() {
+        for batch in &mut self.raster_batches {
             if batch.add_rect_if_possible(dest_texture_id,
                                           color_texture_id,
                                           program_id,

src/resource_cache.rs

@@ -94,7 +94,7 @@ impl<K,V> ResourceClassCache<K,V> where K: Clone + Hash + Eq + Debug, V: Resourc
 
     fn expire_old_resources(&mut self, texture_cache: &mut TextureCache, frame_id: FrameId) {
         let mut resources_to_destroy = vec![];
-        for (key, this_frame_id) in self.last_access_times.iter() {
+        for (key, this_frame_id) in &self.last_access_times {
             if *this_frame_id < frame_id {
                 resources_to_destroy.push((*key).clone())
             }

src/resource_list.rs

@@ -160,7 +160,7 @@ impl BuildRequiredResources for AABBTreeNode {
                     let display_item = &draw_list.items[index as usize];
 
                     // Handle border radius for complex clipping regions.
-                    for complex_clip_region in display_item.clip.complex.iter() {
+                    for complex_clip_region in &display_item.clip.complex {
                         resource_list.add_radius_raster_for_border_radii(&complex_clip_region.radii);
                     }
 

src/texture_cache.rs

@@ -822,7 +822,7 @@ impl TextureCache {
                         }
                     }
 
-                    for update in self.pending_updates.updates.iter_mut() {
+                    for update in &mut self.pending_updates.updates {
                         if update.id == old_texture_id {
                             update.id = new_texture_id
                         }

src/util.rs

@@ -49,7 +49,7 @@ impl MatrixHelpers for Matrix4 {
         let bottom_right = self.transform_point(&rect.bottom_right());
         let (mut min_x, mut min_y) = (top_left.x.clone(), top_left.y.clone());
         let (mut max_x, mut max_y) = (min_x.clone(), min_y.clone());
-        for point in [ top_right, bottom_left, bottom_right ].iter() {
+        for point in &[ top_right, bottom_left, bottom_right ] {
             if point.x < min_x {
                 min_x = point.x.clone()
             }