Update GrPaint APIs to reflect lack of multiple color processors.

Change-Id: Ic7799b3c5f4294cba9ff72f8c11a2ad285ab189f
Bug: skia:10217
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/304738
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
diff --git a/src/gpu/GrPaint.cpp b/src/gpu/GrPaint.cpp
index 9c02c7e..724c1be 100644
--- a/src/gpu/GrPaint.cpp
+++ b/src/gpu/GrPaint.cpp
@@ -43,7 +43,7 @@
         *constantColor = SK_PMColor4fTRANSPARENT;
         return true;
     }
-    if (this->numColorFragmentProcessors()) {
+    if (this->hasColorFragmentProcessor()) {
         return false;
     }
     if (kSrc == fXPFactory || (!fXPFactory && fColor.isOpaque())) {