[tracing] Mechanical rename of LevelOfDetail enum to enum class.

base/trace_event/memory_dump_provider.h

Index: base/trace_event/memory_dump_provider.h
diff --git a/base/trace_event/memory_dump_provider.h b/base/trace_event/memory_dump_provider.h
index 9fefdec5a4fd0a827017c3575b2567bd3538d612..02c2c737cc8e6455d9fcb248716f28b1f49d3284 100644
--- a/base/trace_event/memory_dump_provider.h
+++ b/base/trace_event/memory_dump_provider.h
@@ -17,7 +17,7 @@ class ProcessMemoryDump;
 // should generate on dump request. This is to control the size of dumps
 // generated.
 struct MemoryDumpArgs {
-  enum LevelOfDetail { LEVEL_OF_DETAIL_LOW, LEVEL_OF_DETAIL_HIGH };
+  enum class LevelOfDetail { LOW, HIGH };
 
   LevelOfDetail level_of_detail;
 };