Swapping via Quickswap (Polygon/MATIC) chain shows insufficient funds

Reports of insufficient funds even though there are funds here: https://www.reddit.com/r/brave_browser/comments/qvo5px/does_swapping_via_quickswap_polygonmatic_chain/

Steps to reproduce

1. Ensure Polygon is added as a network.
2. Switch your network to Polygon, and make sure you have some MATIC in your account (ping @onyb if you need some).
3. Go to Quickswap Exchange and connect your wallet.
4. Perform a MATIC-USDC exchange, and confirm the transaction on the panel popup.
5. Click on View on Block Explorer in this screenshot and wait for the transaction result in that page to be ready.

Expect Result

The transaction should be successful.

Actual Result

The transaction failed with this error

[darkdh]

In components/brave_wallet/renderer/brave_wallet_js_handler.cc We use gas price emptiness to determine using legacy tx or eip1559 tx but gas price is optional And there is no eip1559 support in polygon (verified by @onyb )

...
  } else if (method == kEthSendTransaction) {
    std::string from;
    auto tx_data =
        ParseEthSendTransactionParams(normalized_json_request, &from);
    if (tx_data && !tx_data->gas_price.empty()) {                   <<<<<<<<<< gas_price should be optional
      brave_wallet_provider_->AddAndApproveTransaction(
          std::move(tx_data), from,
          base::BindOnce(&BraveWalletJSHandler::OnAddAndApproveTransaction,
                         weak_ptr_factory_.GetWeakPtr(), std::move(id),
                         std::move(global_context), std::move(global_callback),
                         std::move(promise_resolver), isolate,
                         force_json_response));
    } else {
      from.clear();
      mojom::TxData1559Ptr tx_data_1559 =
          ParseEthSendTransaction1559Params(normalized_json_request, &from);
      if (!tx_data_1559)
        tx_data_1559 = mojom::TxData1559::New();
      brave_wallet_provider_->AddAndApprove1559Transaction(
          std::move(tx_data_1559), from,
          base::BindOnce(&BraveWalletJSHandler::OnAddAndApproveTransaction,
                         weak_ptr_factory_.GetWeakPtr(), std::move(id),
                         std::move(global_context), std::move(global_callback),
                         std::move(promise_resolver), isolate,
                         force_json_response));
    }
  } else if (method == kEthSign || method == kPersonalSign) {

We should check the network with EthJsonRpcController::GetIsEip1559 to decide use eip1559 or not

[srirambv]

Verification passed on

Brave	1.32.111 Chromium: 96.0.4664.45 (Official Build) (64-bit)
Revision	76e4c1bb2ab4671b8beba3444e61c0f17584b2fc-refs/branch-heads/4664@{#947}
OS	Linux

• Verified test plan from issue description
• Verified able to swap tokens on Quickswap (Polygon/MATIC) Txhash