Remove unused flag from VarDeclaration::Convert.

This method has only one caller, and it always passed `false`.

Change-Id: I306b0d71e2216257c4c5911d66113dde835e826d
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/693256
Commit-Queue: Nicolette Prevost <nicolettep@google.com>
Reviewed-by: Nicolette Prevost <nicolettep@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
3 files changed