Remove a user action that is mostly being dropped from reports anyway.

According to the UMA.TruncatedEvents.UserAction.Type histogram, this is one of
the most commonly dropped user actions, so we're not getting good data about
this event regardless.

R=dmazzoni@chromium.org

Bug: none
Change-Id: Ib43171563b6208a5fbb4402bc1ee6d77275ab41d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2110398
Auto-Submit: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752063}

content/browser/accessibility/browser_accessibility_manager.cc

@@ -882,9 +882,6 @@ void BrowserAccessibilityManager::HitTest(const gfx::Point& point) const {
   if (!delegate_)
     return;
 
-  base::RecordAction(
-      base::UserMetricsAction("Accessibility.NativeApi.HitTest"));
-
   ui::AXActionData action_data;
   action_data.action = ax::mojom::Action::kHitTest;
   action_data.target_point = point;

tools/metrics/actions/actions.xml

@@ -1425,6 +1425,10 @@ should be able to be added at any place in this file.
 </action>
 
 <action name="Accessibility.NativeApi.HitTest">
+  <obsolete>
+    Removed in March 2020 because most events were being trimmed due to the cap
+    on the number of user actions that can be reported in a single log.
+  </obsolete>
   <owner>aleventhal@chromium.org</owner>
   <owner>dmazzoni@chromium.org</owner>
   <description>