[TabStripRedesign] Fix new tab button anchoring on tab close

Fix new tab button anchoring on tab close.
-Only affects TSR enabled & anchoring disabled.

Before: https://drive.google.com/file/d/1MjVqrNRUKabfGDsiN5HTsm5Wg9b636-k/view?usp=drive_link
After: https://drive.google.com/file/d/1uyQOzLifCQgEpApocat3Qxq2ZQzNBb8b/view?usp=drive_link

(cherry picked from commit 0e045fe)

Bug: 1447109
Change-Id: I2cb5ac164dec1ac87c1c0b8e2b4554319f0ef991
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4573732
Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Commit-Queue: Neil Coronado <nemco@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#1150940}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4582707
Reviewed-by: Zhe Li <zheliooo@google.com>
Commit-Queue: Zhe Li <zheliooo@google.com>
Auto-Submit: Neil Coronado <nemco@google.com>
Cr-Commit-Position: refs/branch-heads/5790@{#233}
Cr-Branched-From: 1d71a33-refs/heads/main@{#1148114}

chrome/android/java/src/org/chromium/chrome/browser/compositor/overlays/strip/StripLayoutHelper.java

@@ -1267,7 +1267,7 @@ private void resizeStripOnTabClose(int tabId, Tab nextTab) {
         }
 
         // 4. Add new tab button offset animation.
-        if (!ChromeFeatureList.sTabStripRedesign.isEnabled()) {
+        if (isNewTabButtonAnchorDisabled()) {
             CompositorAnimator newTabButtonOffsetAnimator = updateNewTabButtonState(true);
             if (newTabButtonOffsetAnimator != null) {
                 tabStripAnimators.add(newTabButtonOffsetAnimator);