Always use filterColor4f to filter paint colors

The rationale here wasn't even correct before - filterColor4f did not
use a linearized version of the stored color (for mode color filter),
so it's always safe and correct to call the 4f version.

Change-Id: I7087342e531e1768c945f78fb2126954b2dc5a86
Reviewed-on: https://skia-review.googlesource.com/132088
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Auto-Submit: Brian Osman <brianosman@google.com>
2 files changed