remove redundant code from action-bar-element (primer#3216)

Co-authored-by: AdamShwert <adamshwert@github.com>
Co-authored-by: Alon Dahari <alondahari@github.com>
Co-authored-by: Arelia Jones <2359538+arelia@users.noreply.github.com>
Co-authored-by: Cam McHenry <camchenry@users.noreply.github.com>
Co-authored-by: Chris Maynard <ctmayn@github.com>
Co-authored-by: Cody Bodfield <cbodfield@github.com>
Co-authored-by: Dusty Greif <dustin.greif@gmail.com>
Co-authored-by: Jibran Garcia <jibrang@github.com>
Co-authored-by: Marie Lucca <40550942+francinelucca@users.noreply.github.com>
Co-authored-by: Cameron Dutro <camertron@gmail.com>
Co-authored-by: Jon Rohan <rohan@github.com>

.changeset/weak-birds-unite.md

@@ -0,0 +1,5 @@
+---
+'@primer/view-components': patch
+---
+
+Remove redundant code for better performance.

app/components/primer/alpha/action_bar_element.ts

@@ -36,14 +36,6 @@ class ActionBarElement extends HTMLElement {
   #focusZoneAbortController: AbortController | null = null
 
   connectedCallback() {
-    // Calculate the width of all the items before hiding anything
-    for (const item of this.items) {
-      const width = item.getBoundingClientRect().width
-      const marginLeft = parseInt(window.getComputedStyle(item)?.marginLeft, 10)
-      const marginRight = parseInt(window.getComputedStyle(item)?.marginRight, 10)
-      item.setAttribute('data-offset-width', `${width + marginLeft + marginRight}`)
-    }
-
     resizeObserver.observe(this)
     instersectionObserver.observe(this)