Coverity: Pass values by reference.

chrome/browser/memory_details_mac.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 <set>
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 66 matching lines @@
     process.process_name = UTF8ToUTF16(process_template[index].process_name);
     process_data_.push_back(process);
   }
 }
 
 ProcessData* MemoryDetails::ChromeBrowser() {
   return &process_data_[CHROME_BROWSER];
 }
 
 void MemoryDetails::CollectProcessData(
-    std::vector<ProcessMemoryInformation> child_info) {
+    const std::vector<ProcessMemoryInformation>& child_info) {
   // This must be run on the file thread to avoid jank (|ProcessInfoSnapshot|
   // runs /bin/ps, which isn't instantaneous).
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
 
   // Clear old data.
   for (size_t index = 0; index < MAX_BROWSERS; index++)
     process_data_[index].processes.clear();
 
   // First, we use |NamedProcessIterator| to get the PIDs of the processes we're
   // interested in; we save our results to avoid extra calls to
@@ skipping 121 matching lines @@
     }
   }
 
   // Memory info.
   process_info.GetCommittedKBytesOfPID(info.pid, &info.committed);
   process_info.GetWorkingSetKBytesOfPID(info.pid, &info.working_set);
 
   // Add the process info to our list.
   process_data_[CHROME_BROWSER].processes.push_back(info);
 }