Componentize spellcheck [1]: create component and move switches there.

components/spellcheck/common/spellcheck_switches.cc

+// Copyright 2016 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 "build/build_config.h"
+#include "components/spellcheck/common/spellcheck_switches.h"
+
+namespace spellcheck {
+namespace switches {
+
+#if defined(ENABLE_SPELLCHECK)
+#if defined(OS_ANDROID)
+// Enables use of the Android spellchecker.
+const char kEnableAndroidSpellChecker[] = "enable-android-spellchecker";
+#endif  // defined(OS_ANDROID)
+
+// Enables participation in the field trial for user feedback to spelling
+// service.
+const char kEnableSpellingFeedbackFieldTrial[] =
+    "enable-spelling-feedback-field-trial";
+
+// Specifies the number of seconds between sending batches of feedback to
+// spelling service. The default is 30 minutes. The minimum is 5 seconds. This
+// switch is for temporary testing only.
+// TODO(rouslan): Remove this flag when feedback testing is complete. Revisit by
+// August 2013.
+const char kSpellingServiceFeedbackIntervalSeconds[] =
+    "spelling-service-feedback-interval-seconds";
+
+// Specifies the URL where spelling service feedback data will be sent instead
+// of the default URL. This switch is for temporary testing only.
+// TODO(rouslan): Remove this flag when feedback testing is complete. Revisit by
+// August 2013.
+const char kSpellingServiceFeedbackUrl[] = "spelling-service-feedback-url";
+#endif  // defined(ENABLE_SPELLCHECK)
+
+}  // namespace switches
+}  // namespace spellcheck