tools/gn: add trace_event file to keep bootstrap working

This patch adds the missing heap_profiler_type_name_deduplicator.cc to
the sources list to keep the boostrap process working.

BUG=None
TEST=./tools/gn/bootstrap/bootstrap.py
TBR=brettw@chromium.org

Review URL: https://codereview.chromium.org/1485333004

Cr-Original-Commit-Position: refs/heads/master@{#362702}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b88f335613144fd2ec38760f487eb5cf4d27230b
diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index 3f0d2d7..cc82738 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -248,6 +248,7 @@
       'base/trace_event/heap_profiler_allocation_context.cc',
       'base/trace_event/heap_profiler_allocation_context_tracker.cc',
       'base/trace_event/heap_profiler_stack_frame_deduplicator.cc',
+      'base/trace_event/heap_profiler_type_name_deduplicator.cc',
       'base/trace_event/memory_allocator_dump.cc',
       'base/trace_event/memory_allocator_dump_guid.cc',
       'base/trace_event/memory_dump_manager.cc',