Revert of Make it possible for tests to set up trace event handlers.

webrtc/BUILD.gn

Index: webrtc/BUILD.gn
diff --git a/webrtc/BUILD.gn b/webrtc/BUILD.gn
index ac3b02a20f3e0bd3287fdd017b6325fd010eb417..58b5f5e74004efdf86ca154e3e838d678faeeb16 100644
--- a/webrtc/BUILD.gn
+++ b/webrtc/BUILD.gn
@@ -25,17 +25,6 @@
   ldflags = []
   if (build_with_mozilla) {
     defines += [ "WEBRTC_MOZILLA_BUILD" ]
-  }
-  # Some tests need to declare their own trace event handlers. If this define is
-  # not set, the first time TRACE_EVENT_* is called it will store the return
-  # value for the current handler in an static variable, so that subsequent
-  # changes to the handler for that TRACE_EVENT_* will be ignored.
-  # So when tests are included, we set this define, making it possible to use
-  # different event handlers in different tests.
-  if (rtc_include_tests) {
-    defines += [ "WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS=1" ]
-  } else {
-    defines += [ "WEBRTC_NON_STATIC_TRACE_EVENT_HANDLERS=0" ]
   }
   if (build_with_chromium) {
     defines = [