Use string for Histogram names since these are all ASCII anyway wide-characte...

chrome/browser/memory_details.cc

 // Copyright (c) 2006-2008 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/memory_details.h"
 #include <psapi.h>
 
 #include "base/file_version_info.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_thread.h"
@@ skipping 233 matching lines @@
 
   ProcessData browser = process_data_[CHROME_BROWSER];
   size_t aggregate_memory = 0;
   int plugin_count = 0;
   int worker_count = 0;
   for (size_t index = 0; index < browser.processes.size(); index++) {
     int sample = static_cast<int>(browser.processes[index].working_set.priv);
     aggregate_memory += sample;
     switch (browser.processes[index].type) {
      case ChildProcessInfo::BROWSER_PROCESS:
-       UMA_HISTOGRAM_MEMORY_KB(L"Memory.Browser", sample);
+       UMA_HISTOGRAM_MEMORY_KB("Memory.Browser", sample);
        break;
      case ChildProcessInfo::RENDER_PROCESS:
-       UMA_HISTOGRAM_MEMORY_KB(L"Memory.Renderer", sample);
+       UMA_HISTOGRAM_MEMORY_KB("Memory.Renderer", sample);
        break;
      case ChildProcessInfo::PLUGIN_PROCESS:
-       UMA_HISTOGRAM_MEMORY_KB(L"Memory.Plugin", sample);
+       UMA_HISTOGRAM_MEMORY_KB("Memory.Plugin", sample);
        plugin_count++;
        break;
      case ChildProcessInfo::WORKER_PROCESS:
-       UMA_HISTOGRAM_MEMORY_KB(L"Memory.Worker", sample);
+       UMA_HISTOGRAM_MEMORY_KB("Memory.Worker", sample);
        worker_count++;
        break;
     }
   }
 
-  UMA_HISTOGRAM_COUNTS_100(L"Memory.ProcessCount",
+  UMA_HISTOGRAM_COUNTS_100("Memory.ProcessCount",
       static_cast<int>(browser.processes.size()));
-  UMA_HISTOGRAM_COUNTS_100(L"Memory.PluginProcessCount", plugin_count);
-  UMA_HISTOGRAM_COUNTS_100(L"Memory.WorkerProcessCount", worker_count);
+  UMA_HISTOGRAM_COUNTS_100("Memory.PluginProcessCount", plugin_count);
+  UMA_HISTOGRAM_COUNTS_100("Memory.WorkerProcessCount", worker_count);
 
   int total_sample = static_cast<int>(aggregate_memory / 1000);
-  UMA_HISTOGRAM_MEMORY_MB(L"Memory.Total", total_sample);
+  UMA_HISTOGRAM_MEMORY_MB("Memory.Total", total_sample);
 }