Remove declaration of surfaceFillContext

The implementation of skgpu::v2::Device::surfaceFillContext() was
recently removed, also remove its declaration to revent link time
errors.

Change-Id: I2c2d7673e9bb824d79c47c4e00423c63228c9161
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/437120
Reviewed-by: Ben Wagner <bungeman@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
diff --git a/src/gpu/v2/Device_v2.h b/src/gpu/v2/Device_v2.h
index 6270c2c..152d3e7 100644
--- a/src/gpu/v2/Device_v2.h
+++ b/src/gpu/v2/Device_v2.h
@@ -44,8 +44,6 @@
 
     GrSurfaceProxyView readSurfaceView() override;
 
-    skgpu::SurfaceFillContext* surfaceFillContext() override;
-
     bool wait(int numSemaphores,
               const GrBackendSemaphore* waitSemaphores,
               bool deleteSemaphoresAfterWait) override {