Rename a conflicting trace.

chrome/test/startup/startup_test.cc

Index: chrome/test/startup/startup_test.cc
diff --git a/chrome/test/startup/startup_test.cc b/chrome/test/startup/startup_test.cc
index 4c9d08df850cb4a21e3b6eecebe1f395e818962b..1a9ee841873edd2c85ab42927030df4b16c8b5dd 100644
--- a/chrome/test/startup/startup_test.cc
+++ b/chrome/test/startup/startup_test.cc
@@ -166,7 +166,8 @@ TEST_F(StartupTest, PerfCold) {
 TEST_F(StartupTest, PerfExtensionEmpty) {
   SetUpWithFileURL();
   SetUpWithExtensionsProfile("empty");
-  RunStartupTest("warm", "t", false /* cold */, false /* not important */,
+  RunStartupTest("warm", "extension_empty",
+                 false /* cold */, false /* not important */,
                  UITest::DEFAULT_THEME);
 }