Make shared memory allocation possible for all child process types.

content/common/view_messages.h

 // Copyright (c) 2011 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.
 
 // IPC messages for page rendering.
 // Multiply-included message file, hence no include guard.
 
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/common/common_param_traits.h"
@@ skipping 1738 matching lines @@
 
 // Updates the minimum/maximum allowed zoom percent for this tab from the
 // default values.  If |remember| is true, then the zoom setting is applied to
 // other pages in the site and is saved, otherwise it only applies to this
 // tab.
 IPC_MESSAGE_ROUTED3(ViewHostMsg_UpdateZoomLimits,
                     int /* minimum_percent */,
                     int /* maximum_percent */,
                     bool /* remember */)
 
-// Asks the browser to create a block of shared memory for the renderer to
-// fill in and pass back to the browser.
-IPC_SYNC_MESSAGE_CONTROL1_1(ViewHostMsg_AllocateSharedMemoryBuffer,
-                            uint32 /* buffer size */,
-                            base::SharedMemoryHandle /* browser handle */)
-
 // Notify the browser that this render process can or can't be suddenly
 // terminated.
 IPC_MESSAGE_CONTROL1(ViewHostMsg_SuddenTerminationChanged,
                      bool /* enabled */)
 
 #if defined(OS_MACOSX)
 // On OSX, we cannot allocated shared memory from within the sandbox, so
 // this call exists for the renderer to ask the browser to allocate memory
 // on its behalf. We return a file descriptor to the POSIX shared memory.
 // If the |cache_in_browser| flag is |true|, then a copy of the shmem is kept
@@ skipping 172 matching lines @@
                      media::MediaLogEvent /* event */)
 
 // Requests to lock the mouse. Will result in a ViewMsg_LockMouse_ACK message
 // being sent back.
 IPC_MESSAGE_ROUTED0(ViewHostMsg_LockMouse)
 
 // Requests to unlock the mouse. A ViewMsg_MouseLockLost message will be sent
 // whenever the mouse is unlocked (which may or may not be caused by
 // ViewHostMsg_UnlockMouse).
 IPC_MESSAGE_ROUTED0(ViewHostMsg_UnlockMouse)