Rewrite std::string("") to std::string(), Linux edition.

chrome/test/perf/startup_test.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/environment.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 277 matching lines @@
         set_template_user_data(base::FilePath());
       }
     }
 
     std::string times;
     for (int i = 0; i < numCycles; ++i) {
       base::StringAppendF(&times,
                           "%.2f,",
                           timings[i].end_to_end.InMillisecondsF());
     }
-    perf_test::PrintResultList(graph, "", trace, times, "ms", important);
+    perf_test::PrintResultList(
+        graph, std::string(), trace, times, "ms", important);
 
     if (num_tabs > 0) {
       std::string name_base = trace;
       std::string name;
 
       times.clear();
       name = name_base + "-start";
       for (int i = 0; i < numCycles; ++i)
         base::StringAppendF(&times, "%.2f,", timings[i].first_start_ms);
-      perf_test::PrintResultList(graph, "", name.c_str(), times, "ms",
-                                 important);
+      perf_test::PrintResultList(
+          graph, std::string(), name.c_str(), times, "ms", important);
 
       times.clear();
       name = name_base + "-first";
       for (int i = 0; i < numCycles; ++i)
         base::StringAppendF(&times, "%.2f,", timings[i].first_stop_ms);
-      perf_test::PrintResultList(graph, "", name.c_str(), times, "ms",
-                                 important);
+      perf_test::PrintResultList(
+          graph, std::string(), name.c_str(), times, "ms", important);
 
       if (nth_timed_tab > 0) {
         // Display only the time necessary to load the first n tabs.
         times.clear();
         name = name_base + "-" + base::IntToString(nth_timed_tab);
         for (int i = 0; i < numCycles; ++i)
           base::StringAppendF(&times, "%.2f,", timings[i].nth_tab_stop_ms);
-        perf_test::PrintResultList(graph, "", name.c_str(), times, "ms",
-                                   important);
+        perf_test::PrintResultList(
+            graph, std::string(), name.c_str(), times, "ms", important);
       }
 
       if (num_tabs > 1) {
         // Display the time necessary to load all of the tabs.
         times.clear();
         name = name_base + "-all";
         for (int i = 0; i < numCycles; ++i)
           base::StringAppendF(&times, "%.2f,", timings[i].last_stop_ms);
-        perf_test::PrintResultList(graph, "", name.c_str(), times, "ms",
-                                   important);
+        perf_test::PrintResultList(
+            graph, std::string(), name.c_str(), times, "ms", important);
       }
     }
   }
 
   base::FilePath profiling_file_;
   bool collect_profiling_stats_;
   bool tracing_enabled_;
   std::string trace_file_prefix_;
 };
 
@@ skipping 180 matching lines @@
   SetUpWithFileURL();
   SetUpWithProfiling();
   SetUpWithForceCompositingMode();
   SetUpWithTracing("startup_trace_fcm_");
   RunStartupTest("warm", "traced_profiling_scripts1_fcm", WARM, NOT_IMPORTANT,
                  UITestBase::DEFAULT_THEME, 1, 0);
 }
 #endif
 
 }  // namespace