Missing include header when enable_base_tracing=false.

Bug: 1093406
Change-Id: If12b3273af093a5ae43bc5d001bfd661de55a12e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2260657
Commit-Queue: Jeremy Leconte <jleconte@google.com>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781446}

base/profiler/stack_copier_signal.cc

@@ -11,6 +11,7 @@
 
 #include <atomic>
 
+#include "base/notreached.h"
 #include "base/profiler/register_context.h"
 #include "base/profiler/stack_buffer.h"
 #include "base/profiler/suspendable_thread_delegate.h"