Bug 1666975 - Remove PENDING_CRITICAL_INPUT_WHEN_TIMEOUT telemetry probe r=smaug

This probe is no longer needed.

Differential Revision: https://phabricator.services.mozilla.com/D91456

dom/base/TimeoutManager.cpp

@@ -400,27 +400,6 @@ void TimeoutManager::UpdateBudget(const TimeStamp& aNow,
   mLastBudgetUpdate = aNow;
 }
 
-size_t TimeoutManager::GetNumPendingInputs() {
-  ContentChild* contentChild = ContentChild::GetSingleton();
-  mozilla::ipc::MessageChannel* channel =
-      contentChild ? contentChild->GetIPCChannel() : nullptr;
-
-  if (channel) {
-    size_t count = 0;
-    channel->PeekMessages([&count](const IPC::Message& aMsg) -> bool {
-      if (nsContentUtils::IsMessageCriticalInputEvent(aMsg)) {
-        // The max number we can record in the telemetry is 80,
-        // so we don't need to continue the counting.
-        if (++count > 80) {
-          return false;
-        }
-      }
-      return true;
-    });
-    return count;
-  }
-  return 0;
-}
 // The longest interval (as PRIntervalTime) we permit, or that our
 // timer code can handle, really. See DELAY_INTERVAL_LIMIT in
 // nsTimerImpl.h for details.
@@ -911,8 +890,6 @@ void TimeoutManager::RunTimeout(const TimeStamp& aNow,
         mLastFiringIndex = timeout->mFiringIndex;
 #endif
         // This timeout is good to run.
-        Telemetry::Accumulate(Telemetry::PENDING_CRITICAL_INPUT_WHEN_TIMEOUT,
-                              GetNumPendingInputs());
         bool timeout_was_cleared = window->RunTimeoutHandler(timeout, scx);
 #if MOZ_GECKO_PROFILER
         if (profiler_can_accept_markers()) {

dom/base/TimeoutManager.h

@@ -103,8 +103,6 @@ class TimeoutManager final {
 
   void SetLoading(bool value);
 
-  size_t GetNumPendingInputs();
-
  private:
   void MaybeStartThrottleTimeout();
 

toolkit/components/telemetry/Histograms.json

@@ -1677,17 +1677,6 @@
     "description": "Time between receiving a scroll event on the event loop and compositing its result onto the screen (ms)",
     "bug_numbers": [1500465, 1604818]
   },
-  "PENDING_CRITICAL_INPUT_WHEN_TIMEOUT": {
-    "record_in_processes": ["content"],
-    "products": ["firefox"],
-    "alert_emails": ["perfteam@mozilla.com", "seanfeng@mozilla.com"],
-    "expires_in_version": "84",
-    "kind": "enumerated",
-    "n_values": 80,
-    "releaseChannelCollection": "opt-out",
-    "description": "Measures the number of pending critical input events in the IPC channel when the timeout handler is about to run",
-    "bug_numbers": [1648284]
-  },
   "CANVAS_2D_USED": {
     "record_in_processes": ["main", "content"],
     "products": ["firefox", "fennec"],