Use an explicitly-sized int type across the IPC boundary.

content/browser/renderer_host/render_widget_helper.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_widget_helper.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/lazy_instance.h"
 #include "base/posix/eintr_wrapper.h"
@@ skipping 330 matching lines @@
 
   const std::map<TransportDIB::Id, int>::iterator
       i = allocated_dibs_.find(dib_id);
   if (i == allocated_dibs_.end())
     return NULL;
 
   base::FileDescriptor fd(dup(i->second), true);
   return TransportDIB::Map(fd);
 }
 
-void RenderWidgetHelper::AllocTransportDIB(
-    size_t size, bool cache_in_browser, TransportDIB::Handle* result) {
+void RenderWidgetHelper::AllocTransportDIB(uint32 size,
+                                           bool cache_in_browser,
+                                           TransportDIB::Handle* result) {
   scoped_ptr<base::SharedMemory> shared_memory(new base::SharedMemory());
   if (!shared_memory->CreateAnonymous(size)) {
     result->fd = -1;
     result->auto_close = false;
     return;
   }
 
   shared_memory->GiveToProcess(0 /* pid, not needed */, result);
 
   if (cache_in_browser) {
@@ skipping 23 matching lines @@
        i = allocated_dibs_.begin(); i != allocated_dibs_.end(); ++i) {
     if (HANDLE_EINTR(close(i->second)) < 0)
       PLOG(ERROR) << "close: " << i->first;
   }
 
   allocated_dibs_.clear();
 }
 #endif
 
 }  // namespace content