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

chrome/browser/prerender/prerender_histograms.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/prerender/prerender_histograms.h"
 
 #include <string>
 
 #include "base/format_macros.h"
 #include "base/metrics/field_trial.h"
@@ skipping 74 matching lines @@
                               histogram_name)
 
 #define PREFIXED_HISTOGRAM_ORIGIN_EXPERIMENT(histogram_name, origin, \
                                              experiment, HISTOGRAM) \
   PREFIXED_HISTOGRAM_INTERNAL(origin, experiment, false, HISTOGRAM, \
                               histogram_name)
 
 #define PREFIXED_HISTOGRAM_INTERNAL(origin, experiment, wash, HISTOGRAM, \
                                     histogram_name) { \
   { \
-    /* Do not rename.  HISTOGRAM expects a local variable "name". */ \
-    std::string name = ComposeHistogramName("", histogram_name); \
-    HISTOGRAM; \
+    /* Do not rename.  HISTOGRAM expects a local variable "name". */           \
+    std::string name = ComposeHistogramName(std::string(), histogram_name);    \
+    HISTOGRAM;                                                                 \
   } \
   /* Do not rename.  HISTOGRAM expects a local variable "name". */ \
   std::string name = GetHistogramName(origin, experiment, wash, \
                                       histogram_name); \
   static uint8 recording_experiment = kNoExperiment; \
   if (recording_experiment == kNoExperiment && experiment != kNoExperiment) \
     recording_experiment = experiment; \
   if (wash) { \
     HISTOGRAM; \
   } else if (experiment != kNoExperiment && \
@@ skipping 279 matching lines @@
   return last_experiment_id_;
 }
 
 bool PrerenderHistograms::IsOriginExperimentWash() const {
   if (!WithinWindow())
     return false;
   return origin_experiment_wash_;
 }
 
 }  // namespace prerender