[Sharing Hub] Fix isSharingHubV15Enabled to use correct flag.

Bug: 1109649
Change-Id: Idc383783d2eb0e5a03fee54dcf19aa61e5f28124
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2318555Reviewed-by: Kyle Milka <kmilka@chromium.org>
Commit-Queue: Sophey Dong <sophey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791946}

chrome/android/java/src/org/chromium/chrome/browser/share/ShareDelegateImpl.java

@@ -275,7 +275,7 @@ public class ShareDelegateImpl implements ShareDelegate {
     @Override
     public boolean isSharingHubV15Enabled() {
         return isSharingHubV1Enabled()
-                && ChromeFeatureList.isEnabled(ChromeFeatureList.CHROME_SHARING_HUB);
+                && ChromeFeatureList.isEnabled(ChromeFeatureList.CHROME_SHARING_HUB_V15);
     }
 
     /**