[Webkit-unassigned] [Bug 225947] New: Web Inspector: Uncaught exception: Page.setShowRulers' was not found when starting remote inspection

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=225947

            Bug ID: 225947
           Summary: Web Inspector: Uncaught exception: Page.setShowRulers'
                    was not found when starting remote inspection
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pangle at apple.com
                CC: inspector-bugzilla-changes at group.apple.com,
                    webkit-bug-importer at group.apple.com

It looks like we aren't checking for Page.setShowRulers somewhere in the frontend, and since iOS doesn't support rulers, this fails. The Rulers button also appears in the Elements Tab, even though it doesn't do anything.

```
'Page.setShowRulers' was not found (at Connection.js:​162:​29)​
    _dispatchResponseToPromise @ Connection.js:​162:​29
    _dispatchResponse @ Connection.js:​124:​44
    dispatch @ Connection.js:​77:​35
    dispatchMessageFromTarget @ TargetManager.js:​176:​39
    dispatchMessageFromTarget @ TargetObserver.js:​47:​51
    _dispatchEvent @ Connection.js:​210:​26
    dispatch @ Connection.js:​79:​32
    dispatch @ InspectorBackend.js:​232:​52
    ?​ @ MessageDispatcher.js:​42:​34
```

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