Revert of Make a single GrSingleOwner in GrContext

src/gpu/GrDrawingManager.cpp

Index: src/gpu/GrDrawingManager.cpp
diff --git a/src/gpu/GrDrawingManager.cpp b/src/gpu/GrDrawingManager.cpp
index 266aa478edab7168f59e6bf2bb972c55423124eb..2a27f6aac453557aca310f1629563d01929f6348 100644
--- a/src/gpu/GrDrawingManager.cpp
+++ b/src/gpu/GrDrawingManager.cpp
@@ -202,5 +202,5 @@
         return nullptr;
     }
 
-    return new GrDrawContext(this, rt, surfaceProps, fSingleOwner);
-}
+    return new GrDrawContext(this, rt, surfaceProps);
+}