alloy-win: Disable the WinUseBrowserSpellChecker feature (see issue c…

…hromiumembedded#3055)

Workaround until support for the Windows 10+ spellcheck service is added for
the Alloy runtime.

libcef/common/alloy/alloy_main_delegate.cc

@@ -31,6 +31,7 @@
 #include "components/component_updater/component_updater_paths.h"
 #include "components/content_settings/core/common/content_settings_pattern.h"
 #include "components/embedder_support/switches.h"
+#include "components/spellcheck/common/spellcheck_features.h"
 #include "components/viz/common/features.h"
 #include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
@@ -250,6 +251,12 @@ bool AlloyMainDelegate::BasicStartupComplete(int* exit_code) {
       disable_features.push_back(features::kCalculateNativeWinOcclusion.name);
     }
 
+    if (spellcheck::kWinUseBrowserSpellChecker.default_state ==
+        base::FEATURE_ENABLED_BY_DEFAULT) {
+      // TODO: Add support for windows spellcheck service (see issue #3055).
+      disable_features.push_back(spellcheck::kWinUseBrowserSpellChecker.name);
+    }
+
     if (!disable_features.empty()) {
       DCHECK(!base::FeatureList::GetInstance());
       std::string disable_features_str =