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

content/shell/shell_test_configuration.cc

Index: content/shell/shell_test_configuration.cc
diff --git a/content/shell/shell_test_configuration.cc b/content/shell/shell_test_configuration.cc
deleted file mode 100644
index 6caff2edc7a0b1765a7f7e3ae9e498f12300ffe8..0000000000000000000000000000000000000000
--- a/content/shell/shell_test_configuration.cc
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) 2013 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/shell/shell_test_configuration.h"
-
-namespace content {
-
-ShellTestConfiguration::ShellTestConfiguration()
-    : enable_pixel_dumping(true),
-      layout_test_timeout(30 * 1000),
-      allow_external_pages(false) {}
-
-ShellTestConfiguration::~ShellTestConfiguration() {}
-
-}  // namespace content