* fix: fill uploadData property
* fix: requestHeaders in onBeforeSendHeaders
* fix: responseHeaders in onHeadersReceived
* fix: header keys should not be lowercased
* fix: gin::Dictionary::Get succeeds even though key does not exist...
* fix: throw for invalid filters
* test: re-enable api-web-request-spec
* chore: do not use deprecated base::Value API
* spec: replace assert with expect in api-browser-view-spec.js
* spec: replace assert with expect in api-touch-bar-spec.js
* spec: replace assert with expect in api-web-frame-spec.js
* spec: replace assert with expect in api-web-contents-view-spec.js
* spec: replace assert with expect in security-warnings-spec.js
* spec: replace assert with expect in api-menu-item-spec.js
* spec: replace assert with expect in api-web-request-spec.js
* spec: replace assert with expect in api-remote-spec.js
* spec: replace assert with expect in api-session-spec.js
* spec: replace assert with expect in api-system-preferences-spec.js
* spec: replace assert with expect in api-browser-window-spec.js
* spec: replace assert with expect in webview-spec.js
* spec: replace assert with expect in api-net-spec.js
* spec: replace assert with expect in api-protocol-spec.js
* spec: replace assert with expect api-web-contents-spec.js
* spec: replace assert with expect in api-shell-spec.js
* spec: replace assert with expect in modules-spec.js
* spec: replace assert with expect in chromium-spec.js
* spec: replace assert with expect in api-crash-reporter-spec.js
* spec: replace assert with expect in asar-spec.js
* spec: rename assert-helpers to expect-helpers
* address PR feedback
