Revert "[Sharesheet] Record ShareAction invocations."

This reverts commit a1ce46be.

Reason for revert: Need to add new enum to enums.xml.

Original change's description:
> [Sharesheet] Record ShareAction invocations.
>
> Bug: 1148694
> Change-Id: I2843e2c39c3ad5229b45b5889a76cb93b1795689
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537505
> Commit-Queue: Avi Drissman <avi@chromium.org>
> Reviewed-by: Avi Drissman <avi@chromium.org>
> Auto-Submit: Melissa Zhang <melzhang@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#827325}

TBR=avi@chromium.org,melzhang@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 1148694
Change-Id: I02b569aed30b452093cb3dc1e5020ec8f0282e8c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2551899Reviewed-by: Melissa Zhang <melzhang@chromium.org>
Commit-Queue: Melissa Zhang <melzhang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830092}

chrome/browser/sharesheet/sharesheet_metrics.h

@@ -14,8 +14,7 @@ class SharesheetMetrics {
   enum class UserAction {
     kCancelled = 0,  // User cancelled sharesheet.
     kArc,            // Opened an ARC app.
-    kAction,         // User selected an action.
-    kMaxValue = kAction,
+    kMaxValue = kArc,
   };
 
   SharesheetMetrics();

chrome/browser/sharesheet/sharesheet_service.cc

@@ -86,8 +86,6 @@ void SharesheetService::OnTargetSelected(uint32_t delegate_id,
         sharesheet_action_cache_->GetActionFromName(target_name);
     if (share_action == nullptr)
       return;
-    sharesheet::SharesheetMetrics::RecordSharesheetActionMetrics(
-        sharesheet::SharesheetMetrics::UserAction::kAction);
     delegate->OnActionLaunched();
     share_action->LaunchAction(delegate, share_action_view, std::move(intent));
   } else if (type == TargetType::kApp) {