Two TaskManager tests are flaky on debug due to a DCHECK in SharedSampler

chrome/browser/task_manager/sampling/shared_sampler_win.cc

Index: chrome/browser/task_manager/sampling/shared_sampler_win.cc
diff --git a/chrome/browser/task_manager/sampling/shared_sampler_win.cc b/chrome/browser/task_manager/sampling/shared_sampler_win.cc
index 6dd6647272d7c6d6be2f193181de116293b2fb1f..4cd06e986356e47e9d70536d15eb17bc3df8475d 100644
--- a/chrome/browser/task_manager/sampling/shared_sampler_win.cc
+++ b/chrome/browser/task_manager/sampling/shared_sampler_win.cc
@@ -356,12 +356,13 @@ void SharedSampler::UnregisterCallbacks(base::ProcessId process_id) {
 
 void SharedSampler::Refresh(base::ProcessId process_id, int64_t refresh_flags) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  DCHECK(callbacks_map_.find(process_id) != callbacks_map_.end());
   DCHECK_NE(0, refresh_flags & GetSupportedFlags());
 
   if (process_id == 0)
     return;
 
+  DCHECK(callbacks_map_.find(process_id) != callbacks_map_.end());
+
   if (refresh_flags_ == 0) {
     base::PostTaskAndReplyWithResult(
         blocking_pool_runner_.get(), FROM_HERE,