scons: excise more scons references from the code base

ipc/ipc_message_impl_macros.h

 // 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.
 
 // The file ipc_messsage_macros.h defines the classes for individual
 // messages. This file works similarly, except that it defines the
 // implementations of the constructors and the logging methods. (These only
 // have to be generated once). It is meant to be included in a XXX_messages.cc
 // file.
 
 #ifndef IPC_IPC_MESSAGE_IMPL_MACROS_H_
 #define IPC_IPC_MESSAGE_IMPL_MACROS_H_
 
 #include "ipc/ipc_message_utils.h"
 #include "ipc/ipc_message_utils_impl.h"
 
 #ifndef MESSAGES_INTERNAL_IMPL_FILE
 #error This file should only be included by X_messages.cc, which needs to define MESSAGES_INTERNAL_IMPL_FILE first.
 #endif
 
-// Trick scons and xcode into seeing the possible real dependencies since they
+// Trick xcode into seeing the possible real dependencies since they
 // don't understand #include MESSAGES_INTERNAL_FILE. See http://crbug.com/7828
 #if 0
 #include "ipc/ipc_sync_message_unittest.h"
 #include "chrome/common/automation_messages_internal.h"
 #include "chrome/common/devtools_messages_internal.h"
 #include "chrome/common/gpu_messages_internal.h"
 #include "chrome/common/nacl_messages_internal.h"
 #include "chrome/common/plugin_messages_internal.h"
 #include "chrome/common/render_messages_internal.h"
 #include "chrome/common/service_messages_internal.h"
@@ skipping 669 matching lines @@
 #define IPC_MESSAGE_MACROS_INCLUDE_BLOCK
 
 // Redefine MESSAGES_INTERNAL_FILE just for the header check in
 // ipc_messages_macros.h that happens before it breaks on the header guard.
 #define MESSAGES_INTERNAL_FILE MESSAGES_INTERNAL_IMPL_FILE
 
 // Include our INTERNAL file first to get the normal expansion.
 #include MESSAGES_INTERNAL_IMPL_FILE
 
 #endif  // IPC_IPC_MESSAGE_IMPL_MACROS_H_