Update base::Value list usage in android_webview/

In particular, use Value::List instead of base::Value::ListStorage /
std::vector<base::Value>.

Bug: 1338341
Change-Id: I440ffe07ac302cdfab923ddf54a0b2ff02602233
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3767157
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1026908}

android_webview/browser/enterprise_authentication_app_link_policy_handler.cc

@@ -68,14 +68,17 @@ void EnterpriseAuthenticationAppLinkPolicyHandler::ApplyPolicySettings(
   if (!value)
     return;
 
-  std::vector<base::Value> filtered_values;
+  base::Value::List filtered_values;
   for (const auto& entry : value->GetList()) {
     const std::string* url = entry.FindStringKey("url");
     if (ValidatePolicyEntry(url))
-      filtered_values.emplace_back(*url);
+      filtered_values.Append(*url);
+  }
+  if (filtered_values.size() > policy::kMaxUrlFiltersPerPolicy) {
+    filtered_values.erase(
+        filtered_values.begin() + policy::kMaxUrlFiltersPerPolicy,
+        filtered_values.end());
   }
-  if (filtered_values.size() > policy::kMaxUrlFiltersPerPolicy)
-    filtered_values.resize(policy::kMaxUrlFiltersPerPolicy);
 
   prefs->SetValue(pref_path_, base::Value(std::move(filtered_values)));
 }