ime: Remove unused old feature flags.

None of these are used in the internal VK code.

Change-Id: I28d9658372fbef6208a9bc1efc7ec2b7c271e29f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2371149Reviewed-by: Keith Lee <keithlee@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802097}

chrome/browser/extensions/api/virtual_keyboard_private/chrome_virtual_keyboard_delegate.cc

@@ -369,15 +369,6 @@ void ChromeVirtualKeyboardDelegate::OnHasInputDevices(
   results->SetBoolean("hotrodmode", g_hotrod_keyboard_enabled);
   std::unique_ptr<base::ListValue> features(new base::ListValue());
 
-  // TODO(https://crbug.com/880659): Cleanup these flags after removing these
-  // flags from IME extension.
-  features->AppendString(GenerateFeatureFlag("floatingkeyboard", true));
-  features->AppendString(GenerateFeatureFlag("gesturetyping", true));
-  // TODO(https://crbug.com/890134): Implement gesture editing.
-  features->AppendString(GenerateFeatureFlag("gestureediting", false));
-  features->AppendString(GenerateFeatureFlag("fullscreenhandwriting", false));
-  features->AppendString(GenerateFeatureFlag("virtualkeyboardmdui", true));
-
   keyboard::KeyboardConfig config = keyboard_client->GetKeyboardConfig();
   // TODO(oka): Change this to use config.voice_input.
   features->AppendString(GenerateFeatureFlag(