Bug 1677774 - Relax CanSet for TouchEventsOverrideInternal. r=nika

As a temporary fix to prevent crashes we are loosening the `CanSet`
restrictions for TouchEventsOverrideInternal. In the future this will
be fixed properly by changing DevTools to set this property from the
parent only, at which time tighter restrictions on setting
`TouchEventsOverrideInternal` may be added.

Differential Revision: https://phabricator.services.mozilla.com/D103080

docshell/base/BrowsingContext.cpp

@@ -2459,7 +2459,8 @@ bool BrowsingContext::CanSet(
     FieldIndex<IDX_TouchEventsOverrideInternal>,
     const enum TouchEventsOverride& aTouchEventsOverride,
     ContentParent* aSource) {
-  return CheckOnlyOwningProcessCanSet(aSource);
+  // TODO: Bug 1688948 - Should only be set in the parent process.
+  return true;
 }
 
 bool BrowsingContext::CanSet(FieldIndex<IDX_DisplayMode>,