cc: Avoid extra flush calls to Skia GrContext

cc/raster/scoped_gpu_raster.cc

Index: cc/raster/scoped_gpu_raster.cc
diff --git a/cc/raster/scoped_gpu_raster.cc b/cc/raster/scoped_gpu_raster.cc
index e6dcf231ba2dcda9036566c79c34e9c2651b54aa..9807c2992748c9ec6f0135026b3ee7a1b9c7e8ac 100644
--- a/cc/raster/scoped_gpu_raster.cc
+++ b/cc/raster/scoped_gpu_raster.cc
@@ -34,9 +34,6 @@ void ScopedGpuRaster::BeginGpuRaster() {
 }
 
 void ScopedGpuRaster::EndGpuRaster() {
-  class GrContext* gr_context = context_provider_->GrContext();
-  gr_context->flush();
-
   GLES2Interface* gl = context_provider_->ContextGL();
 
   // Restore default GL unpack alignment.  TextureUploader expects this.