Add a new GetInstance() method for singleton classes used in chrome/browser files.

chrome/browser/memory_details.cc

 // Copyright (c) 2010 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 "base/file_version_info.h"
 #include "base/metrics/histogram.h"
 #include "base/process_util.h"
 #include "base/string_util.h"
@@ skipping 84 matching lines @@
   // Now go do expensive memory lookups from the file thread.
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       NewRunnableMethod(this, &MemoryDetails::CollectProcessData, child_info));
 }
 
 void MemoryDetails::CollectChildInfoOnUIThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
 #if defined(OS_LINUX)
-  const pid_t zygote_pid = Singleton<ZygoteHost>()->pid();
-  const pid_t sandbox_helper_pid = Singleton<RenderSandboxHostLinux>()->pid();
+  const pid_t zygote_pid = ZygoteHost::GetInstance()->pid();
+  const pid_t sandbox_helper_pid = RenderSandboxHostLinux::GetInstance()->pid();
 #endif
 
   ProcessData* const chrome_browser = ChromeBrowser();
   // Get more information about the process.
   for (size_t index = 0; index < chrome_browser->processes.size();
       index++) {
     // Check if it's a renderer, if so get the list of page titles in it and
     // check if it's a diagnostics-related process.  We skip all diagnostics
     // pages (e.g. "about:xxx" URLs).  Iterate the RenderProcessHosts to find
     // the tab contents.
@@ skipping 141 matching lines @@
   UMA_HISTOGRAM_COUNTS_100("Memory.ProcessCount",
       static_cast<int>(browser.processes.size()));
   UMA_HISTOGRAM_COUNTS_100("Memory.PluginProcessCount", plugin_count);
   UMA_HISTOGRAM_COUNTS_100("Memory.WorkerProcessCount", worker_count);
   // TODO(viettrungluu): Do we want separate counts for the other
   // (platform-specific) process types?
 
   int total_sample = static_cast<int>(aggregate_memory / 1000);
   UMA_HISTOGRAM_MEMORY_MB("Memory.Total", total_sample);
 }