chore: remove no-op EnableWebComponentsV0 feature (#29127)

Co-authored-by: Jeremy Rose <[email protected]>

shell/browser/feature_list.cc

@@ -38,12 +38,6 @@ void InitializeFeatureList() {
       std::string(",") +
       net::features::kCookiesWithoutSameSiteMustBeSecure.name;
 
-  // https://www.polymer-project.org/blog/2018-10-02-webcomponents-v0-deprecations
-  // https://chromium-review.googlesource.com/c/chromium/src/+/1869562
-  // Any website which uses older WebComponents will fail in without this
-  // enabled, since Electron does not support origin trials.
-  enable_features += std::string(",") + "WebComponentsV0Enabled";
-
 #if !BUILDFLAG(ENABLE_PICTURE_IN_PICTURE)
   disable_features += std::string(",") + media::kPictureInPicture.name;
 #endif