[base] Add note about ~CheckError's name being signifiant for the crash service

Bug: 1071058, 1031540
Change-Id: I9a8e9abed41a65e5571acc1b86f30adfd3e35c25
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2150593
Commit-Queue: Hans Wennborg <hans@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Hans Wennborg <hans@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#759277}

base/check.cc

@@ -89,6 +89,9 @@ std::ostream& CheckError::stream() {
 }
 
 CheckError::~CheckError() {
+  // Note: This function ends up in crash stack traces. If its full name
+  // changes, the crash server's magic signature logic needs to be updated.
+  // See cl/306632920.
   delete log_message_;
 }