fix an instance of bugprone-argument-comment

This new clang-tidy check complains when param names /*in_comments=*/
don't match up with the actual parameter name they're being passed to.
Sometimes this is benign, other times, actual bugs are found.

Bug: 1136209
Change-Id: I7971bff40d0fe6f1f567b1aee963d3d5811feb54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2459052Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: George Burgess <gbiv@chromium.org>
Cr-Commit-Position: refs/heads/master@{#815553}

components/sync_bookmarks/synced_bookmark_tracker_unittest.cc

@@ -572,7 +572,7 @@ TEST(SyncedBookmarkTrackerTest, ShouldNotInvalidateMetadata) {
 
   histogram_tester.ExpectUniqueSample(
       "Sync.BookmarksModelMetadataCorruptionReason",
-      /*sample=*/ExpectedCorruptionReason::NO_CORRUPTION, /*count=*/1);
+      /*sample=*/ExpectedCorruptionReason::NO_CORRUPTION, /*expected_count=*/1);
 }
 
 TEST(SyncedBookmarkTrackerTest, ShouldInvalidateMetadataIfMissingMobileFolder) {