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

chrome/browser/page_cycler/page_cycler.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 "chrome/browser/page_cycler/page_cycler.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/message_loop.h"
@@ skipping 174 matching lines @@
 void PageCycler::PrepareResultsOnBackgroundThread() {
   CHECK(!content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
   std::string output;
   if (!stats_file_.empty()) {
 #if defined(OS_POSIX)
     base::ProcessId pid = base::GetParentProcessId(base::GetCurrentProcId());
 #elif defined(OS_WIN)
     base::ProcessId pid = base::GetCurrentProcId();
 #endif  // OS_WIN
     ChromeProcessList chrome_processes(GetRunningChromeProcesses(pid));
-    output += perf_test::MemoryUsageInfoToString("", chrome_processes, pid);
-    output += perf_test::IOPerfInfoToString("", chrome_processes, pid);
-    output += perf_test::SystemCommitChargeToString("",
-              base::GetSystemCommitCharge(), false);
+    output += perf_test::MemoryUsageInfoToString(
+        std::string(), chrome_processes, pid);
+    output +=
+        perf_test::IOPerfInfoToString(std::string(), chrome_processes, pid);
+    output += perf_test::SystemCommitChargeToString(
+        std::string(), base::GetSystemCommitCharge(), false);
     output.append("Pages: [" + urls_string_ + "]\n");
     output.append("*RESULT times: t_ref= [" + timings_string_ + "] ms\n");
   }
   WriteResultsOnBackgroundThread(output);
 }
 
 void PageCycler::WriteResultsOnBackgroundThread(const std::string& output) {
   CHECK(!content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 
   if (!output.empty()) {
@@ skipping 48 matching lines @@
     aborted_ = true;
     error_.append(ASCIIToUTF16(
         "Browser was closed before the run was completed."));
     DLOG(WARNING) <<
         "Page Cycler: browser was closed before the run was completed.";
     content::BrowserThread::PostBlockingPoolTask(
         FROM_HERE,
         base::Bind(&PageCycler::PrepareResultsOnBackgroundThread, this));
   }
 }