The correct type for the size of a chunk of memory is size_t.

content/browser/renderer_host/render_sandbox_host_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 "content/browser/renderer_host/render_sandbox_host_linux.h"
 
 #include <fcntl.h>
 #include <fontconfig/fontconfig.h>
 #include <stdint.h>
 #include <unistd.h>
@@ skipping 373 matching lines @@
 
     Pickle reply;
     reply.WriteInt(pid);
     SendRendererReply(fds, reply, -1);
   }
 
   void HandleMakeSharedMemorySegment(int fd, const Pickle& pickle,
                                      PickleIterator iter,
                                      std::vector<int>& fds) {
     base::SharedMemoryCreateOptions options;
-    if (!pickle.ReadUInt32(&iter, &options.size))
+    uint32_t size;
+    if (!pickle.ReadUInt32(&iter, &size))
       return;
+    options.size = size;
     if (!pickle.ReadBool(&iter, &options.executable))
       return;
     int shm_fd = -1;
     base::SharedMemory shm;
     if (shm.Create(options))
       shm_fd = shm.handle().fd;
     Pickle reply;
     SendRendererReply(fds, reply, shm_fd);
   }
 
@@ skipping 337 matching lines @@
 RenderSandboxHostLinux::~RenderSandboxHostLinux() {
   if (initialized_) {
     if (HANDLE_EINTR(close(renderer_socket_)) < 0)
       PLOG(ERROR) << "close";
     if (HANDLE_EINTR(close(childs_lifeline_fd_)) < 0)
       PLOG(ERROR) << "close";
   }
 }
 
 }  // namespace content