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

chrome/common/chrome_switches.h

 // 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 the shared command-line switches used by code in the Chrome
 // directory that don't have anywhere more specific to go.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
@@ skipping 248 matching lines @@
 extern const char kV8PacMojoInProcess[];
 extern const char kV8PacMojoOutOfProcess[];
 extern const char kValidateCrx[];
 extern const char kVersion[];
 extern const char kWindowPosition[];
 extern const char kWindowSize[];
 extern const char kWindowWorkspace[];
 extern const char kWinHttpProxyResolver[];
 extern const char kWinJumplistAction[];
 
-#if defined(ENABLE_SPELLCHECK)
-#if defined(OS_ANDROID)
-extern const char kEnableAndroidSpellChecker[];
-#endif  // defined(OS_ANDROID)
-extern const char kEnableSpellingFeedbackFieldTrial[];
-extern const char kSpellingServiceFeedbackIntervalSeconds[];
-extern const char kSpellingServiceFeedbackUrl[];
-#endif  // defined(ENABLE_SPELLCHECK)
-
 #if defined(GOOGLE_CHROME_BUILD)
 extern const char kEnableGoogleBrandedContextMenu[];
 #endif  // defined(GOOGLE_CHROME_BUILD)
 
 #if !defined(GOOGLE_CHROME_BUILD)
 extern const char kLocalNtpReload[];
 #endif
 
 #if defined(OS_ANDROID)
 extern const char kAuthAndroidNegotiateAccountType[];
@@ skipping 109 matching lines @@
 #if defined(OS_CHROMEOS)
 bool PowerOverlayEnabled();
 #endif
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_