Removed unused in_scroll_transaction and removed import of std::time:Instant since it was only used by in_scroll_transaction.

components/compositing/compositor.rs

@@ -32,7 +32,6 @@ use std::fs::{File, create_dir_all};
 use std::io::Write;
 use std::num::NonZeroU32;
 use std::rc::Rc;
-use std::time::Instant;
 use style_traits::{CSSPixel, DevicePixel, PinchZoomFactor};
 use style_traits::cursor::CursorKind;
 use style_traits::viewport::ViewportConstraints;
@@ -166,8 +165,6 @@ pub struct IOCompositor<Window: WindowMethods> {
     /// image for the reftest framework.
     ready_to_save_state: ReadyState,
 
-    in_scroll_transaction: Option<Instant>,
-
     /// The webrender renderer.
     webrender: webrender::Renderer,
 
@@ -320,7 +317,6 @@ impl<Window: WindowMethods> IOCompositor<Window> {
             time_profiler_chan: state.time_profiler_chan,
             last_composite_time: 0,
             ready_to_save_state: ReadyState::Unknown,
-            in_scroll_transaction: None,
             webrender: state.webrender,
             webrender_document: state.webrender_document,
             webrender_api: state.webrender_api,
@@ -843,7 +839,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
         &mut self,
         delta: ScrollLocation,
         cursor: DeviceIntPoint,
-        phase: TouchEventType,
+        phase: TouchEventType
     ) {
         match phase {
             TouchEventType::Move => self.on_scroll_window_event(delta, cursor),
@@ -856,8 +852,11 @@ impl<Window: WindowMethods> IOCompositor<Window> {
         }
     }
 
-    fn on_scroll_window_event(&mut self, scroll_location: ScrollLocation, cursor: DeviceIntPoint) {
-        self.in_scroll_transaction = Some(Instant::now());
+    fn on_scroll_window_event(
+        &mut self,
+        scroll_location: ScrollLocation,
+        cursor: DeviceIntPoint
+    ) {
         self.pending_scroll_zoom_events.push(ScrollZoomEvent {
             magnification: 1.0,
             scroll_location: scroll_location,