Fix race in INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO

webrtc/base/trace_event.h

Index: webrtc/base/trace_event.h
diff --git a/webrtc/base/trace_event.h b/webrtc/base/trace_event.h
index 3916af4fb61bf713139f60f617c02793b24ade3e..3789886a1ccec44be1b0e615681a1614cf198965 100644
--- a/webrtc/base/trace_event.h
+++ b/webrtc/base/trace_event.h
@@ -577,11 +577,8 @@
 
 // Implementation detail: internal macro to create static category.
 #define INTERNAL_TRACE_EVENT_GET_CATEGORY_INFO(category) \
-    static const unsigned char* INTERNAL_TRACE_EVENT_UID(catstatic) = 0; \
-    if (!INTERNAL_TRACE_EVENT_UID(catstatic)) { \
-      INTERNAL_TRACE_EVENT_UID(catstatic) = \
-          TRACE_EVENT_API_GET_CATEGORY_ENABLED(category); \
-    }
+    static const unsigned char* INTERNAL_TRACE_EVENT_UID(catstatic) = \
+        TRACE_EVENT_API_GET_CATEGORY_ENABLED(category);
 
 // Implementation detail: internal macro to create static category and add
 // event if the category is enabled.