Revert of [Startup Tracing] Add --trace-config-file flag

components/tracing/BUILD.gn

Index: components/tracing/BUILD.gn
diff --git a/components/tracing/BUILD.gn b/components/tracing/BUILD.gn
index bd5b2711492b16ba648880ec8e350a503a6b7237..059f4f14330318bd12a3dffe9db840f88e54121a 100644
--- a/components/tracing/BUILD.gn
+++ b/components/tracing/BUILD.gn
@@ -23,8 +23,8 @@
 
 component("startup_tracing") {
   sources = [
-    "trace_config_file.cc",
-    "trace_config_file.h",
+    "startup_tracing.cc",
+    "startup_tracing.h",
     "tracing_export.h",
     "tracing_switches.cc",
     "tracing_switches.h",
@@ -36,17 +36,3 @@
     "//base",
   ]
 }
-
-source_set("unit_tests") {
-  testonly = true
-
-  sources = [
-    "trace_config_file_unittest.cc",
-  ]
-
-  deps = [
-    ":startup_tracing",
-    "//base/test:test_support",
-    "//testing/gtest",
-  ]
-}