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

chrome/test/perf/frame_rate/frame_rate_tests.cc

Index: chrome/test/perf/frame_rate/frame_rate_tests.cc
diff --git a/chrome/test/perf/frame_rate/frame_rate_tests.cc b/chrome/test/perf/frame_rate/frame_rate_tests.cc
index 7be2b36e8beedc84b9c647c5b84c3354f7336532..7b36b2708c064e64a730d4c174171c71d1e0bf6f 100644
--- a/chrome/test/perf/frame_rate/frame_rate_tests.cc
+++ b/chrome/test/perf/frame_rate/frame_rate_tests.cc
@@ -196,8 +196,10 @@ class FrameRateTest
     // race condition caused by an html redirect. If that is the case, verify
     // that flag kHasRedirect is enabled for the current test.
     ASSERT_TRUE(WaitUntilJavaScriptCondition(
-      tab, L"", L"window.domAutomationController.send(__initialized);",
-      TestTimeouts::large_test_timeout()));
+        tab,
+        std::wstring(),
+        L"window.domAutomationController.send(__initialized);",
+        TestTimeouts::large_test_timeout()));
 
     if (HasFlag(kForceGpuComposited)) {
       ASSERT_TRUE(tab->NavigateToURLAsync(
@@ -209,7 +211,9 @@ class FrameRateTest
 
     // Block until the tests completes.
     ASSERT_TRUE(WaitUntilJavaScriptCondition(
-        tab, L"", L"window.domAutomationController.send(!__running_all);",
+        tab,
+        std::wstring(),
+        L"window.domAutomationController.send(!__running_all);",
         TestTimeouts::large_test_timeout()));
 
     // TODO(jbates): remove this check when ref builds are updated.
@@ -225,7 +229,7 @@ class FrameRateTest
     // Read out the results.
     std::wstring json;
     ASSERT_TRUE(tab->ExecuteAndExtractString(
-        L"",
+        std::wstring(),
         L"window.domAutomationController.send("
         L"JSON.stringify(__calc_results_total()));",
         &json));
@@ -247,8 +251,12 @@ class FrameRateTest
                                                 results["sigmas"].c_str());
 
     std::string mean_and_error = results["mean"] + "," + results["sigma"];
-    perf_test::PrintResultMeanAndError(name, "", trace_name, mean_and_error,
-                                       "milliseconds-per-frame", true);
+    perf_test::PrintResultMeanAndError(name,
+                                       std::string(),
+                                       trace_name,
+                                       mean_and_error,
+                                       "milliseconds-per-frame",
+                                       true);
 
     // Navigate back to NTP so that we can quit without timing out during the
     // wait-for-idle stage in test framework.