[Android] Add AndroidSpellChecker feature to allow for gradual rollout using finch.

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index f3b8bcb45f8670daf40870d18e2a0d8ab4da70e6..1e98c971f84eccd44dea1102742d98f9d6fe3713 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -133,7 +133,6 @@
 #include "components/rappor/rappor_utils.h"
 #include "components/security_interstitials/core/ssl_error_ui.h"
 #include "components/signin/core/common/profile_management_switches.h"
-#include "components/spellcheck/common/spellcheck_switches.h"
 #include "components/startup_metric_utils/browser/startup_metric_host_impl.h"
 #include "components/subresource_filter/content/browser/content_subresource_filter_driver_factory.h"
 #include "components/subresource_filter/content/browser/subresource_filter_navigation_throttle.h"
@@ -1648,9 +1647,6 @@ void ChromeContentBrowserClient::AppendExtraCommandLineSwitches(
       switches::kDisableCastStreamingHWEncoding,
       switches::kDisableJavaScriptHarmonyShipping,
       switches::kDisableNewBookmarkApps,
-#if defined(ENABLE_SPELLCHECK) && defined(OS_ANDROID)
-      spellcheck::switches::kEnableAndroidSpellChecker,
-#endif
       switches::kEnableBenchmarking,
       switches::kEnableNaCl,
 #if !defined(DISABLE_NACL)