This CL replaces most usages of `.from` (e.g.
`List<String>.from(variable)`) to use `.of` instead.
This is done because code like
`List<String> foo = new List<String>.from([null])`
is valid and gives no warnings or errors.
Using `.of` instead will give an error.
Also `.of` appears to be slightly faster.
Change-Id: I1b4327be228b77e6a3e9faa283f8ce64f0565608
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/228642
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>
Jens Johansen
441dca77fd