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

chrome/test/perf/page_cycler_test.cc

Index: chrome/test/perf/page_cycler_test.cc
diff --git a/chrome/test/perf/page_cycler_test.cc b/chrome/test/perf/page_cycler_test.cc
index 4354faf8d89eeedd5589142a474cedcdd3757728..9d130002dad1b5f01aba6ee05e5a444654f1c250 100644
--- a/chrome/test/perf/page_cycler_test.cc
+++ b/chrome/test/perf/page_cycler_test.cc
@@ -215,10 +215,11 @@ class PageCyclerTest : public UIPerfTest {
 
     // Get the timing cookie value from the DOM automation.
     std::wstring wcookie;
-    ASSERT_TRUE(tab->ExecuteAndExtractString(L"",
-          L"window.domAutomationController.send("
-          L"JSON.stringify(__get_timings()));",
-          &wcookie));
+    ASSERT_TRUE(tab->ExecuteAndExtractString(
+        std::wstring(),
+        L"window.domAutomationController.send("
+        L"JSON.stringify(__get_timings()));",
+        &wcookie));
     cookie = base::SysWideToNativeMB(wcookie);
 
     // JSON.stringify() encapsulates the returned string in quotes, strip them.
@@ -260,8 +261,8 @@ class PageCyclerTest : public UIPerfTest {
 
     printf("Pages: [%s]\n", base::SysWideToNativeMB(pages).c_str());
 
-    perf_test::PrintResultList(graph, "", trace_name, timings, "ms",
-                               true /* important */);
+    perf_test::PrintResultList(
+        graph, std::string(), trace_name, timings, "ms", true /* important */);
   }
 
   void RunTest(const char* graph, const char* name, bool use_http) {
@@ -275,7 +276,7 @@ class PageCyclerTest : public UIPerfTest {
     ASSERT_TRUE(tab.get());
     std::wstring whistogram;
     ASSERT_TRUE(tab->ExecuteAndExtractString(
-        L"",
+        std::wstring(),
         L"window.domAutomationController.send("
         L"window.domAutomationController.getHistogram ? "
         L"window.domAutomationController.getHistogram(\"" +