Make DETECT_IMPORTANT_CONTENT the default Plugins content setting based

components/plugins/common/plugins_switches.h

Index: components/plugins/common/plugins_switches.h
diff --git a/components/plugins/common/plugins_switches.h b/components/plugins/common/plugins_switches.h
new file mode 100644
index 0000000000000000000000000000000000000000..57500b734d0ac67e4c6802fc5db57afe804f9219
--- /dev/null
+++ b/components/plugins/common/plugins_switches.h
@@ -0,0 +1,17 @@
+// Copyright 2015 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.
+
+#ifndef COMPONENTS_PLUGINS_COMMON_PLUGIN_SWITCHES_H_
+#define COMPONENTS_PLUGINS_COMMON_PLUGIN_SWITCHES_H_
+
+namespace plugins {
+namespace switches {
+
+extern const char kDisablePluginPowerSaver[];
+extern const char kEnablePluginPowerSaver[];
+
+}  // namespace switches
+}  // namespace plugins
+
+#endif  // COMPONENTS_PLUGINS_COMMON_PLUGIN_SWITCHES_H_