[content shell] move code common to several processes to a common dir

content/shell/shell_switches.h

Index: content/shell/shell_switches.h
diff --git a/content/shell/shell_switches.h b/content/shell/shell_switches.h
deleted file mode 100644
index e89ff26e216a6896229907e5463487f6c0661e66..0000000000000000000000000000000000000000
--- a/content/shell/shell_switches.h
+++ /dev/null
@@ -1,25 +0,0 @@
-// 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.
-
-// Defines all the "content_shell" command-line switches.
-
-#ifndef CONTENT_SHELL_SHELL_SWITCHES_H_
-#define CONTENT_SHELL_SHELL_SWITCHES_H_
-
-namespace switches {
-
-extern const char kAllowExternalPages[];
-extern const char kCheckLayoutTestSysDeps[];
-extern const char kContentBrowserTest[];
-extern const char kContentShellDataPath[];
-extern const char kDisableHeadlessForLayoutTests[];
-extern const char kDumpRenderTree[];
-extern const char kEnableAccelerated2DCanvas[];
-extern const char kEnableSoftwareCompositing[];
-extern const char kNoTimeout[];
-extern const char kOutputLayoutTestDifferences[];
-
-}  // namespace switches
-
-#endif  // CONTENT_SHELL_SHELL_SWITCHES_H_