Remove std::string histogram name from HistogramBase object.

third_party/webrtc_overrides/init_webrtc.cc

 // Copyright 2013 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 "init_webrtc.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
@@ skipping 47 matching lines @@
           base::HistogramBase::kUmaTargetedHistogramFlag));
 }
 
 Histogram* HistogramFactoryGetEnumeration(
     const std::string& name, int boundary) {
   return reinterpret_cast<Histogram*>(
       base::LinearHistogram::FactoryGet(name, 1, boundary, boundary + 1,
           base::HistogramBase::kUmaTargetedHistogramFlag));
 }
 
-const std::string& GetHistogramName(Histogram* histogram_pointer) {
+const char* GetHistogramName(Histogram* histogram_pointer) {
   base::HistogramBase* ptr =
       reinterpret_cast<base::HistogramBase*>(histogram_pointer);
   return ptr->histogram_name();
 }
 
 void HistogramAdd(Histogram* histogram_pointer, int sample) {
   base::HistogramBase* ptr =
       reinterpret_cast<base::HistogramBase*>(histogram_pointer);
   ptr->Add(sample);
 }
 }  // namespace metrics
 }  // namespace webrtc
 
 bool InitializeWebRtcModule() {
   // Workaround for crbug.com/176522
   // On Linux, we can't fetch the number of cores after the sandbox has been
   // initialized, so we call DetectNumberOfCores() here, to cache the value.
   webrtc::CpuInfo::DetectNumberOfCores();
   webrtc::SetupEventTracer(&GetCategoryGroupEnabled, &AddTraceEvent);
   return true;
 }