Coverity: Pass values by reference.

chrome/browser/memory_details_linux.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 <unistd.h>
 #include <fcntl.h>
 #include <dirent.h>
 
@@ skipping 182 matching lines @@
         next_wavefront.insert(i->pid);
       }
     }
 
     wavefront.clear();
     wavefront.swap(next_wavefront);
   }
 }
 
 void MemoryDetails::CollectProcessData(
-    std::vector<ProcessMemoryInformation> child_info) {
+    const std::vector<ProcessMemoryInformation>& child_info) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 
   std::vector<Process> processes;
   GetProcesses(&processes);
   std::set<pid_t> browsers_found;
 
   // For each process on the system, if it appears to be a browser process and
   // it's parent isn't a browser process, then record it in |browsers_found|.
   for (std::vector<Process>::const_iterator
        i = processes.begin(); i != processes.end(); ++i) {
@@ skipping 50 matching lines @@
     }
 
     process_data_.push_back(browser);
   }
 
   // Finally return to the browser thread.
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       NewRunnableMethod(this, &MemoryDetails::CollectChildInfoOnUIThread));
 }