Exclude spellcheck related code properly on android/ios which doesn't have spellchecker

chrome/browser/about_flags.cc

 // 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.
 
 #include "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 853 matching lines @@
     kOsDesktop,
     SINGLE_VALUE_TYPE(switches::kEnableDevToolsExperiments)
   },
   {
     "silent-debugger-extension-api",
     IDS_FLAGS_SILENT_DEBUGGER_EXTENSION_API_NAME,
     IDS_FLAGS_SILENT_DEBUGGER_EXTENSION_API_DESCRIPTION,
     kOsDesktop,
     SINGLE_VALUE_TYPE(switches::kSilentDebuggerExtensionAPI)
   },
+#if defined(ENABLE_SPELLCHECK)
   {
     "spellcheck-autocorrect",
     IDS_FLAGS_SPELLCHECK_AUTOCORRECT,
     IDS_FLAGS_SPELLCHECK_AUTOCORRECT_DESCRIPTION,
     kOsWin | kOsLinux | kOsCrOS,
     SINGLE_VALUE_TYPE(switches::kEnableSpellingAutoCorrect)
   },
+#endif
   {
     "enable-scroll-prediction",
     IDS_FLAGS_ENABLE_SCROLL_PREDICTION_NAME,
     IDS_FLAGS_ENABLE_SCROLL_PREDICTION_DESCRIPTION,
     kOsDesktop,
     SINGLE_VALUE_TYPE(switches::kEnableScrollPrediction)
   },
   {
     "touch-events",
     IDS_TOUCH_EVENTS_NAME,
@@ skipping 540 matching lines @@
     MULTI_VALUE_TYPE(kTabCaptureUpscaleQualityChoices)
   },
   {
     "tab-capture-downscale-quality",
     IDS_FLAGS_TAB_CAPTURE_DOWNSCALE_QUALITY_NAME,
     IDS_FLAGS_TAB_CAPTURE_DOWNSCALE_QUALITY_DESCRIPTION,
     kOsAll,
     MULTI_VALUE_TYPE(kTabCaptureDownscaleQualityChoices)
   },
 #endif
+#if defined(ENABLE_SPELLCHECK)
   {
     "enable-spelling-feedback-field-trial",
     IDS_FLAGS_ENABLE_SPELLING_FEEDBACK_FIELD_TRIAL_NAME,
     IDS_FLAGS_ENABLE_SPELLING_FEEDBACK_FIELD_TRIAL_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kEnableSpellingFeedbackFieldTrial)
   },
+#endif
   {
     "enable-webgl-draft-extensions",
     IDS_FLAGS_ENABLE_WEBGL_DRAFT_EXTENSIONS_NAME,
     IDS_FLAGS_ENABLE_WEBGL_DRAFT_EXTENSIONS_DESCRIPTION,
     kOsAll,
     SINGLE_VALUE_TYPE(switches::kEnableWebGLDraftExtensions)
   },
   {
     "enable-web-midi",
     IDS_FLAGS_ENABLE_WEB_MIDI_NAME,
@@ skipping 1166 matching lines @@
 }
 
 const Experiment* GetExperiments(size_t* count) {
   *count = num_experiments;
   return experiments;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags