Remove the checked-in scons configuration files.

base/base_main.scons

Index: base/base_main.scons
===================================================================
--- base/base_main.scons	(revision 12583)
+++ base/base_main.scons	(working copy)
@@ -1,27 +0,0 @@
-# Copyright (c) 2006-2008 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.
-
-__doc__ = """
-Configuration for building the entire base "solution", including all
-the specific targets in various *.scons files, and a base.sln file
-on Windows.
-"""
-
-Import('env')
-
-# Arrange for Hammer to add all programs to the 'base' Alias.
-env.Append(
-    COMPONENT_PROGRAM_GROUPS = ['base'],
-    COMPONENT_TEST_PROGRAM_GROUPS = ['base'],
-)
-
-sconscript_files = [
-    'base.scons',
-    'base_gfx.scons',
-    'base_sln.scons',
-    'base_unittests.scons',
-    'debug_message.scons',
-]
-
-env.SConscript(sconscript_files, exports=['env'])