Remove synthetic delay framework

Remove the synthetic delay framework and associated benchmarks since
they have not uncovered any regressions recently and new benchmarks have
not been added.

BUG=703604,413829,413829,368532,483212,508538

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: Id1c4d03a7954ab7847fe88478c466cc37b763a38
Reviewed-on: https://chromium-review.googlesource.com/549415
Commit-Queue: Sami Kyöstilä <skyostil@chromium.org>
Reviewed-by: Primiano Tucci <primiano@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#484006}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 56398249f62df4942576ebbaec482d6fd8cea9a7
diff --git a/tools/gn/bootstrap/bootstrap.py b/tools/gn/bootstrap/bootstrap.py
index 7d77264..0721c68 100755
--- a/tools/gn/bootstrap/bootstrap.py
+++ b/tools/gn/bootstrap/bootstrap.py
@@ -562,7 +562,6 @@
       'base/trace_event/trace_event_filter.cc',
       'base/trace_event/trace_event_impl.cc',
       'base/trace_event/trace_event_memory_overhead.cc',
-      'base/trace_event/trace_event_synthetic_delay.cc',
       'base/trace_event/trace_log.cc',
       'base/trace_event/trace_log_constants.cc',
       'base/trace_event/tracing_agent.cc',