[Ozone] Fix build

ui/ozone/public/surface_ozone_canvas.h

Index: ui/ozone/public/surface_ozone_canvas.h
diff --git a/ui/ozone/public/surface_ozone_canvas.h b/ui/ozone/public/surface_ozone_canvas.h
index d02338b70e1ca1a9fce27a2ab8359736ea18ae7c..42347c3dba53f2f37845773377c9e6c1d0f39c4a 100644
--- a/ui/ozone/public/surface_ozone_canvas.h
+++ b/ui/ozone/public/surface_ozone_canvas.h
@@ -10,7 +10,7 @@
 #include "skia/ext/refptr.h"
 #include "ui/ozone/ozone_base_export.h"
 
-class SkCanvas;
+class SkSurface;
 
 namespace gfx {
 class Size;
@@ -27,8 +27,8 @@ class OZONE_BASE_EXPORT SurfaceOzoneCanvas {
  public:
   virtual ~SurfaceOzoneCanvas() {}
 
-  // Returns an SkCanvas for drawing on the window.
-  virtual skia::RefPtr<SkCanvas> GetCanvas() = 0;
+  // Returns an SkSurface for drawing on the window.
+  virtual skia::RefPtr<SkSurface> GetSurface() = 0;
 
   // Attempts to resize the canvas to match the viewport size. After
   // resizing, the compositor must call GetCanvas() to get the next