removed src="about:blank" from devtool

[errorr404]

with src="about:blank" in webview for devtool view. it will crash the application.

Description of Change

removed src="about:blank" from contents.setDevToolsWebContents(devToolsWebContents) example

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• npm test passes
• tests are changed or added
• relevant documentation is changed or added
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[jkleinsc]

@errorr404 which version of Electron are you seeing this in? I just tested this on Electron v13.0.0-nightly.20210208 and it works correctly as documented. In fact if I run it with your change, it no longer works.

[errorr404]

@errorr404 which version of Electron are you seeing this in? I just tested this on Electron v13.0.0-nightly.20210208 and it works correctly as documented. In fact if I run it with your change, it no longer works.

@jkleinsc i am using Electron v8.5.5, i am using a webview for showing devtool content, by using src="about:blank" on the webview i got application crash, it is working fine without src="about:blank" for me on Electron v8.5.5.

steps to reproduce:-

• take a webview (for devtool) with src="about:blank"` and another webview (for loading the url) with some url.
• use contents.setDevToolsWebContents(devToolsWebContents)
• open devtool.

[jkleinsc]

@errorr404 ok I see what has happened. For 8-x-y, the documentation is already as you have modified it: https://github.com/electron/electron/blob/v8.5.5/docs/api/web-contents.md#contentssetdevtoolswebcontentsdevtoolswebcontents.
However this documentation was intentionally changed for 9-x-y: #20986. As our documentation always reflects what is in master, the documentation is correct as is, so I am going to close this PR.