We use shouldInterceptRequest inconsistently in our tests, often overriding TestAwContentsClient for simple tasks. We should consider if there's room to clean this up, now that TestAwContentsClient better supports the callback: https://cs.chromium.org/chromium/src/android_webview/javatests/src/org/chromium/android_webview/test/TestAwContentsClient.java?l=528&rcl=8bd0983ecaaba7886714c5f2c4477badef88ee32