Fix build error with gcc-4.7

chrome/browser/memory_details_linux.cc

 // Copyright (c) 2012 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 <sys/types.h>
+#include <unistd.h>
+
 #include <map>
 #include <set>
 
 #include "base/bind.h"
 #include "base/process_util.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/common/chrome_constants.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/process_type.h"
@@ skipping 206 matching lines @@
     if (type != MAX_BROWSERS)
       browser.name = ASCIIToUTF16(kBrowserPrettyNames[type]);
     process_data_.push_back(browser);
   }
 
   // Finally return to the browser thread.
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&MemoryDetails::CollectChildInfoOnUIThread, this));
 }