SK_API in src/gpu cleanup

Change-Id: I14d6f7ef06c3cfcefd0813dd5013e4185b12d8cc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/235804
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrSurfaceContext.h b/src/gpu/GrSurfaceContext.h
index 8c66ac9..eb94a25 100644
--- a/src/gpu/GrSurfaceContext.h
+++ b/src/gpu/GrSurfaceContext.h
@@ -34,7 +34,7 @@
 /**
  * A helper object to orchestrate commands for a particular surface
  */
-class SK_API GrSurfaceContext {
+class GrSurfaceContext {
 public:
     virtual ~GrSurfaceContext() = default;